Enter any two inputs and click on Calculate button
How to use this Ohms Law Calculator 🤔
There are input fields for Voltage \((V)\), Current \((I)\), Resistance \((R)\), and Power \((P)\). Enter any two inputs and click on Calculate button.
The calculator uses the \( V = I \cdot R \) \( P = V \cdot I \) formula, substitues given values, and calcuates the missing value.
The 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:
\(V\) is the voltage in volts (V)
\(I\) is the current in amperes (A)
\(R\) is the resistance in ohms (Ω)
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.
{
"topic": "ohms-law",
"input_types": [
"float",
"float",
"float",
"float"
],
"input_labels": [
"V",
"I",
"R",
"P"
],
"input_descriptions": [
"Voltage",
"Current",
"Resistance",
"Power"
],
"input_units": [
"volts",
"amps",
"ohms",
"watts"
],
"formula_mathjax": "\\( V = I \\cdot R \\)<br>\\( P = V \\cdot I \\)",
"input_values": [
"",
"",
"",
""
],
"input_pre_msg": "Enter any two inputs and click on Calculate button",
"type": "Calculate",
"title": "Ohms Law Calculator",
"description": "Use our Ohm's Law Calculator to easily calculate voltage, current, resistance, and power in electrical circuits. Simply input any two known values to get the results instantly. Perfect for students, engineers, and hobbyists.",
"category": "Electricity",
"template": "physics",
"formulas": [
{
"parameters": [
"I",
"R"
],
"outputs": [
{
"label": "V",
"formula": " I * R ",
"formula_mathjax": "\\( I R \\)",
"formula_mathjax_sub": "\\( I \\times R \\)"
},
{
"label": "P",
"formula": " I * I * R ",
"formula_mathjax": "\\( I ^{2} R \\)",
"formula_mathjax_sub": "\\( I ^{2} \\times R \\)"
}
],
"examples": [
{
"I": 1,
"R": 1000,
"V": "1000",
"P": "1000"
}
]
},
{
"parameters": [
"V",
"I"
],
"outputs": [
{
"label": "R",
"formula": " V / I ",
"formula_mathjax": "\\( \\frac{ V }{ I } \\)"
},
{
"label": "P",
"formula": " V * I ",
"formula_mathjax": "\\( V \\times I \\)"
}
],
"examples": [
{
"V": 12,
"I": 0.02,
"R": "600",
"P": "0.24"
}
]
},
{
"parameters": [
"V",
"R"
],
"outputs": [
{
"label": "I",
"formula": " V / R ",
"formula_mathjax": "\\( \\frac{ V }{ R } \\)"
},
{
"label": "P",
"formula": " V * V / R ",
"formula_mathjax": "\\( \\frac{ V ^2}{ R } \\)"
}
],
"examples": [
{
"V": 230,
"R": 500,
"I": "0.46",
"P": "105.8"
}
]
},
{
"parameters": [
"V",
"P"
],
"outputs": [
{
"label": "I",
"formula": " P / V ",
"formula_mathjax": "\\( \\frac{ P }{ V } \\)"
},
{
"label": "R",
"formula": " V * V / P ",
"formula_mathjax": "\\( \\frac{ V ^2}{ P } \\)"
}
],
"examples": [
{
"V": 230,
"P": 1,
"I": "0.0043",
"R": "52900"
}
]
},
{
"parameters": [
"I",
"P"
],
"outputs": [
{
"label": "V",
"formula": " P / I ",
"formula_mathjax": "\\( \\frac{ P }{ I } \\)"
},
{
"label": "R",
"formula": " P / ( I * I ) ",
"formula_mathjax": "\\( \\frac{ P }{ I ^2} \\)"
}
],
"examples": [
{
"I": 1,
"P": 2,
"V": "2",
"R": "2"
}
]
},
{
"parameters": [
"R",
"P"
],
"outputs": [
{
"label": "V",
"formula": " Math.sqrt( P * R )",
"formula_mathjax": "\\( \\sqrt{ P \\times R } \\)"
},
{
"label": "I",
"formula": " Math.sqrt( P / R )",
"formula_mathjax": "\\( \\sqrt{ P / R } \\)"
}
],
"examples": [
{
"R": 200,
"P": 5,
"V": "31.6228",
"I": "0.1581"
}
]
}
],
"content": "<h2>What is Ohm's Law</h2><p>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:</p><p>\\[ V = I \\cdot R \\]</p><p>Where:</p><ul> <li>\\(V\\) is the voltage in volts (V)</li> <li>\\(I\\) is the current in amperes (A)</li> <li>\\(R\\) is the resistance in ohms (Ω)</li></ul><h2>Calculating Power, Voltage, Current, and Resistance</h2><p>Power (P) in an electrical circuit is given by the product of voltage and current:</p><p>\\[ P = V \\cdot I \\]</p><p>We can rearrange Ohm's Law to solve for voltage, current, and resistance as follows:</p> <p>\\[ I = \\frac{V}{R} \\]</p> <p>\\[ R = \\frac{V}{I} \\]</p> <p>\\[ V = I \\cdot R \\]</p><br><h2>Input and Output Combinations of the Ohms Law Calculator</h2><p>Here are the input combinations available for the calculator, along with the formulas it uses to calculate the corresponding outputs.</p><div class=\"formula_sets\"><div class=\"formula_set set_1\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #1</span><ul class=\"given\"><li><span class=\"input\">I</span> Current</li><li><span class=\"input\">R</span> Resistance</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Voltage</span><span class=\"output\">\\(V = \\)\\( I R \\)</span></li><li><span class=\"output_label\">Power</span><span class=\"output\">\\(P = \\)\\( I ^{2} R \\)</span></li></ul><a class=\"button\" href=\"#example_1\">1 Example</a></div><div class=\"formula_set set_2\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #2</span><ul class=\"given\"><li><span class=\"input\">V</span> Voltage</li><li><span class=\"input\">I</span> Current</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Resistance</span><span class=\"output\">\\(R = \\)\\( \\frac{ V }{ I } \\)</span></li><li><span class=\"output_label\">Power</span><span class=\"output\">\\(P = \\)\\( V \\times I \\)</span></li></ul><a class=\"button\" href=\"#example_2\">1 Example</a></div><div class=\"formula_set set_3\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #3</span><ul class=\"given\"><li><span class=\"input\">V</span> Voltage</li><li><span class=\"input\">R</span> Resistance</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Current</span><span class=\"output\">\\(I = \\)\\( \\frac{ V }{ R } \\)</span></li><li><span class=\"output_label\">Power</span><span class=\"output\">\\(P = \\)\\( \\frac{ V ^2}{ R } \\)</span></li></ul><a class=\"button\" href=\"#example_3\">1 Example</a></div><div class=\"formula_set set_4\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #4</span><ul class=\"given\"><li><span class=\"input\">V</span> Voltage</li><li><span class=\"input\">P</span> Power</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Current</span><span class=\"output\">\\(I = \\)\\( \\frac{ P }{ V } \\)</span></li><li><span class=\"output_label\">Resistance</span><span class=\"output\">\\(R = \\)\\( \\frac{ V ^2}{ P } \\)</span></li></ul><a class=\"button\" href=\"#example_4\">1 Example</a></div><div class=\"formula_set set_5\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #5</span><ul class=\"given\"><li><span class=\"input\">I</span> Current</li><li><span class=\"input\">P</span> Power</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Voltage</span><span class=\"output\">\\(V = \\)\\( \\frac{ P }{ I } \\)</span></li><li><span class=\"output_label\">Resistance</span><span class=\"output\">\\(R = \\)\\( \\frac{ P }{ I ^2} \\)</span></li></ul><a class=\"button\" href=\"#example_5\">1 Example</a></div><div class=\"formula_set set_6\"><span class=\"heading_side\">Calculator Inputs</span><span class=\"set_n\">Set #6</span><ul class=\"given\"><li><span class=\"input\">R</span> Resistance</li><li><span class=\"input\">P</span> Power</li></ul><p>For these given inputs,</p><span class=\"heading_side\">Outputs, Formulas</span><p>We calculate the following outputs:</p><ul class=\"find\"><li><span class=\"output_label\">Voltage</span><span class=\"output\">\\(V = \\)\\( \\sqrt{ P \\times R } \\)</span></li><li><span class=\"output_label\">Current</span><span class=\"output\">\\(I = \\)\\( \\sqrt{ P / R } \\)</span></li></ul><a class=\"button\" href=\"#example_6\">1 Example</a></div></div><br><br><h2>Examples</h2>\n <div id=\"example_1\" class=\"example\">\n <span class=\"example_n\">1</span>\n <h3 class=\"question\">\n Calculate <span>voltage</span> and <span>power</span>, given the <span>current</span> and <span>resistance</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Current, I = 1 amps</li><li>Resistance, R = 1000 ohms</li></ul>\n <p>Calculating voltage (V)...</p><p class=\"step\">\\( V = \\) \\( I R \\)</p><p class=\"step\">\\( V = \\) \\(1\\times1000\\)</p><p class=\"step answer\">\\( V = \\) 1000 volts</p><p>Calculating power (P)...</p><p class=\"step\">\\( P = \\) \\( I ^{2} R \\)</p><p class=\"step\">\\( P = \\) \\(1^{2} \\times1000\\)</p><p class=\"step answer\">\\( P = \\) 1000 watts</p>\n </div>\n \n <div id=\"example_2\" class=\"example\">\n <span class=\"example_n\">2</span>\n <h3 class=\"question\">\n Calculate <span>resistance</span> and <span>power</span>, given the <span>voltage</span> and <span>current</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Voltage, V = 12 volts</li><li>Current, I = 0.02 amps</li></ul>\n <p>Calculating resistance (R)...</p><p class=\"step\">\\( R = \\) \\( \\frac{ V }{ I } \\)</p><p class=\"step\">\\( R = \\) \\( \\frac{12}{0.02} \\)</p><p class=\"step answer\">\\( R = \\) 600 ohms</p><p>Calculating power (P)...</p><p class=\"step\">\\( P = \\) \\( V \\times I \\)</p><p class=\"step\">\\( P = \\) \\(12\\times0.02\\)</p><p class=\"step answer\">\\( P = \\) 0.24 watts</p>\n </div>\n \n <div id=\"example_3\" class=\"example\">\n <span class=\"example_n\">3</span>\n <h3 class=\"question\">\n Calculate <span>current</span> and <span>power</span>, given the <span>voltage</span> and <span>resistance</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Voltage, V = 230 volts</li><li>Resistance, R = 500 ohms</li></ul>\n <p>Calculating current (I)...</p><p class=\"step\">\\( I = \\) \\( \\frac{ V }{ R } \\)</p><p class=\"step\">\\( I = \\) \\( \\frac{230}{500} \\)</p><p class=\"step answer\">\\( I = \\) 0.46 amps</p><p>Calculating power (P)...</p><p class=\"step\">\\( P = \\) \\( \\frac{ V ^2}{ R } \\)</p><p class=\"step\">\\( P = \\) \\( \\frac{230^2}{500} \\)</p><p class=\"step answer\">\\( P = \\) 105.8 watts</p>\n </div>\n \n <div id=\"example_4\" class=\"example\">\n <span class=\"example_n\">4</span>\n <h3 class=\"question\">\n Calculate <span>current</span> and <span>resistance</span>, given the <span>voltage</span> and <span>power</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Voltage, V = 230 volts</li><li>Power, P = 1 watts</li></ul>\n <p>Calculating current (I)...</p><p class=\"step\">\\( I = \\) \\( \\frac{ P }{ V } \\)</p><p class=\"step\">\\( I = \\) \\( \\frac{1}{230} \\)</p><p class=\"step answer\">\\( I = \\) 0.0043 amps</p><p>Calculating resistance (R)...</p><p class=\"step\">\\( R = \\) \\( \\frac{ V ^2}{ P } \\)</p><p class=\"step\">\\( R = \\) \\( \\frac{230^2}{1} \\)</p><p class=\"step answer\">\\( R = \\) 52900 ohms</p>\n </div>\n \n <div id=\"example_5\" class=\"example\">\n <span class=\"example_n\">5</span>\n <h3 class=\"question\">\n Calculate <span>voltage</span> and <span>resistance</span>, given the <span>current</span> and <span>power</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Current, I = 1 amps</li><li>Power, P = 2 watts</li></ul>\n <p>Calculating voltage (V)...</p><p class=\"step\">\\( V = \\) \\( \\frac{ P }{ I } \\)</p><p class=\"step\">\\( V = \\) \\( \\frac{2}{1} \\)</p><p class=\"step answer\">\\( V = \\) 2 volts</p><p>Calculating resistance (R)...</p><p class=\"step\">\\( R = \\) \\( \\frac{ P }{ I ^2} \\)</p><p class=\"step\">\\( R = \\) \\( \\frac{2}{1^2} \\)</p><p class=\"step answer\">\\( R = \\) 2 ohms</p>\n </div>\n \n <div id=\"example_6\" class=\"example\">\n <span class=\"example_n\">6</span>\n <h3 class=\"question\">\n Calculate <span>voltage</span> and <span>current</span>, given the <span>resistance</span> and <span>power</span>\n </h3>\n <h4 class=\"answer\">Answer</h4>\n <p>Given:</p>\n <ul><li>Resistance, R = 200 ohms</li><li>Power, P = 5 watts</li></ul>\n <p>Calculating voltage (V)...</p><p class=\"step\">\\( V = \\) \\( \\sqrt{ P \\times R } \\)</p><p class=\"step\">\\( V = \\) \\( \\sqrt{5\\times200} \\)</p><p class=\"step answer\">\\( V = \\) 31.6228 volts</p><p>Calculating current (I)...</p><p class=\"step\">\\( I = \\) \\( \\sqrt{ P / R } \\)</p><p class=\"step\">\\( I = \\) \\( \\sqrt{5/200} \\)</p><p class=\"step answer\">\\( I = \\) 0.1581 amps</p>\n </div>\n "
}
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