Ohm's Law Calculator

Voltage (V) Current (A)

Resistance (Ω) Power (W)

Enter any two known values and press Calculate.

📖 Frequently Asked Questions (FAQ)

1. What is Ohm's Law?

Ohm's Law describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that the current flowing through a conductor is directly proportional to the voltage across it, provided the temperature and other physical conditions remain unchanged.

2. What is the formula for Ohm's Law?

The three primary formulas derived from Ohm's Law are:

To find Voltage: V = I × R
To find Current: I = V / R
To find Resistance: R = V / I

3. What is electrical power (P)?

Electrical power is the rate at which electrical energy is transferred in a circuit. It is measured in watts (W). The formula for power is P = V × I (Power = Voltage × Current).

4. Why is Ohm's Law important?

It's a foundational principle in electronics used for circuit analysis, calculating component values (like current-limiting resistors), and ensuring components operate safely within their specified limits.