Ohm's Law Current Calculator (I=V/R)

Find the current I=V/R flowing in a circuit from voltage V and resistance R. It also gives power P and conductance, with a circuit diagram.

Input

Enter the voltage V and resistance R to find the current using Ohm''s law I=V/R.

Voltage V

Voltage applied to the circuit (volts)

Resistance R

Resistance of the circuit (ohms)

Current I

0.12A

= 120 mA

Power P

1.44 W

Conductance G

0.01 S

Calculated with Ohm''s law I=V/R, power P=V squared over R, and conductance G=1/R.

Using Ohm's law I=V/R, the current I in amperes is the voltage V in volts divided by the resistance R in ohms.
Power is computed as P=V squared over R in watts (equivalent to P=VI and P=I squared times R).
Conductance is the reciprocal of resistance, G=1/R in siemens (S).
A resistance of 0 makes the current diverge to infinity, so it cannot be calculated.
Values assume an ideal DC circuit. Real circuits are affected by wiring resistance and temperature-dependent resistance changes.

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