Ohm’s Law calculator

ByAbragam Siyon Sing Updated on
Ohm's law calculator

Ohm’s Law calculator is an electric tool used to calculate the voltage, current, or resistance and power when any of the other two parameters are known.

Formulas

Ohm’s Law states that, at a constant temperature, the current through a conductor between two points is directly proportional to the voltage.

  • Ohm’s Law, V = IR
  • Power dissipated, P = VI

Let us consider the electrical circuit shown below. The voltage V is applied to the lamp which has a resistance R through a battery. The current I flows in the circuit.

Ohm's Law calculator circuit

In this circuit, if you have any two known variables, then you can determine the other values. If the lamp resistance and the current flowing through the circuit is known, we can find the value of voltage by using ohm’s Law,

    \[V = IR \]

The power dissipated by the lamp is calculated using the formula,

    \[P=I^2 R\]

If you know the value of current and voltage in the circuit, it is possible to determine the value of lamp resistance from

    \[R=\frac{V}{I}\]

The power dissipated is given by,

    \[P = VI\]

Similarly, when you know the lamp resistance and voltage applied, the current flowing in the circuit can be obtained from,

    \[I=\frac{V}{R}\]

Here, the dissipated power is given by,

    \[P = \frac{V^2}{R}\]

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