Ohm's Law Simulator

Change voltage and resistance to simulate current and power

Voltage V

Resistance ohm

Ohm's Law Formulas

Voltage	V = I x R
Current	I = V / R
Resistance	R = V / I
Power	P = V x I

Step-by-Step Example

With V = 12 V and R = 100 ohm, current is I = 12 / 100 = 0.12 A. Power is P = 12 x 0.12 = 1.44 W, so the resistor would need a power rating above that value in a real circuit.

Practical Rules

Higher voltage increases current if resistance stays fixed.
Higher resistance lowers current if voltage stays fixed.
Power rises quickly when current increases.
Use power results to check component wattage.

Frequently Asked Questions

What is Ohm's law?▼

Ohm's law states that voltage equals current times resistance: V = I R.

How do you calculate current?▼

Current is voltage divided by resistance: I = V / R.

How do you calculate power?▼

Electrical power can be calculated as P = V I, P = I^2 R, or P = V^2 / R.

Why simulate Ohm's law?▼

Simulation helps visualize how changing voltage or resistance changes current and power in a simple circuit.

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