Ohms Law Calculator

Enter any two inputs and click on Calculate button


\( V = I \cdot R \)
\( P = V \cdot I \)

V : volts
I : amps
R : ohms
P : watts





How to use this Ohms Law Calculator 🤔

  1. There are input fields for Voltage \((V)\), Current \((I)\), Resistance \((R)\), and Power \((P)\). Enter any two inputs and click on Calculate button.
  2. The calculator uses the \( V = I \cdot R \)
    \( P = V \cdot I \) formula, substitues given values, and calcuates the missing value(s).
  3. A missing value is calcuated and displayed in the input field. Also, the caculation is displayed under the input section.

What is Ohm's Law

Ohm's Law is a fundamental principle in electronics and electrical engineering that states the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It is typically expressed as:

\[ V = I \cdot R \]

Where:

Calculating Power, Voltage, Current, and Resistance

Power (P) in an electrical circuit is given by the product of voltage and current:

\[ P = V \cdot I \]

We can rearrange Ohm's Law to solve for voltage, current, and resistance as follows:

\[ I = \frac{V}{R} \]

\[ R = \frac{V}{I} \]

\[ V = I \cdot R \]


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps


Input and Output Combinations of the Ohms Law Calculator

Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.

Calculator InputsSet #1
  • I Current
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( I R \)
  • Power\(P = \)\( I ^{2} R \)
1 Example
Calculator InputsSet #2
  • V Voltage
  • I Current

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Resistance\(R = \)\( \frac{ V }{ I } \)
  • Power\(P = \)\( V \times I \)
1 Example
Calculator InputsSet #3
  • V Voltage
  • R Resistance

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ V }{ R } \)
  • Power\(P = \)\( \frac{ V ^2}{ R } \)
1 Example
Calculator InputsSet #4
  • V Voltage
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Current\(I = \)\( \frac{ P }{ V } \)
  • Resistance\(R = \)\( \frac{ V ^2}{ P } \)
1 Example
Calculator InputsSet #5
  • I Current
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \frac{ P }{ I } \)
  • Resistance\(R = \)\( \frac{ P }{ I ^2} \)
1 Example
Calculator InputsSet #6
  • R Resistance
  • P Power

For these given inputs,

Outputs, Formulas

We calculate the following outputs:

  • Voltage\(V = \)\( \sqrt{ P \times R } \)
  • Current\(I = \)\( \sqrt{ P / R } \)
1 Example


Examples

1

Calculate voltage and power, given the current and resistance

Answer

Given:

  • Current, I = 1 amps
  • Resistance, R = 1000 ohms

Calculating voltage (V)...

\( V = \) \( I R \)

\( V = \) \(1\times1000\)

\( V = \) 1000 volts

Calculating power (P)...

\( P = \) \( I ^{2} R \)

\( P = \) \(1^{2} \times1000\)

\( P = \) 1000 watts

2

Calculate resistance and power, given the voltage and current

Answer

Given:

  • Voltage, V = 12 volts
  • Current, I = 0.02 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V }{ I } \)

\( R = \) \( \frac{12}{0.02} \)

\( R = \) 600 ohms

Calculating power (P)...

\( P = \) \( V \times I \)

\( P = \) \(12\times0.02\)

\( P = \) 0.24 watts

3

Calculate current and power, given the voltage and resistance

Answer

Given:

  • Voltage, V = 230 volts
  • Resistance, R = 500 ohms

Calculating current (I)...

\( I = \) \( \frac{ V }{ R } \)

\( I = \) \( \frac{230}{500} \)

\( I = \) 0.46 amps

Calculating power (P)...

\( P = \) \( \frac{ V ^2}{ R } \)

\( P = \) \( \frac{230^2}{500} \)

\( P = \) 105.8 watts

4

Calculate current and resistance, given the voltage and power

Answer

Given:

  • Voltage, V = 230 volts
  • Power, P = 1 watts

Calculating current (I)...

\( I = \) \( \frac{ P }{ V } \)

\( I = \) \( \frac{1}{230} \)

\( I = \) 0.0043 amps

Calculating resistance (R)...

\( R = \) \( \frac{ V ^2}{ P } \)

\( R = \) \( \frac{230^2}{1} \)

\( R = \) 52900 ohms

5

Calculate voltage and resistance, given the current and power

Answer

Given:

  • Current, I = 1 amps
  • Power, P = 2 watts

Calculating voltage (V)...

\( V = \) \( \frac{ P }{ I } \)

\( V = \) \( \frac{2}{1} \)

\( V = \) 2 volts

Calculating resistance (R)...

\( R = \) \( \frac{ P }{ I ^2} \)

\( R = \) \( \frac{2}{1^2} \)

\( R = \) 2 ohms

6

Calculate voltage and current, given the resistance and power

Answer

Given:

  • Resistance, R = 200 ohms
  • Power, P = 5 watts

Calculating voltage (V)...

\( V = \) \( \sqrt{ P \times R } \)

\( V = \) \( \sqrt{5\times200} \)

\( V = \) 31.6228 volts

Calculating current (I)...

\( I = \) \( \sqrt{ P / R } \)

\( I = \) \( \sqrt{5/200} \)

\( I = \) 0.1581 amps