Understanding Ohm's Law

Understanding Ohm’s Law

Ohm’s Law explains the relationship between voltage, current, and resistance in an electrical circuit.

The formula is:

Voltage = Current × Resistance

This is usually written as:

V = I × R

Where:

V = Voltage

I = Current

R = Resistance

Example

If the voltage is 12 volts and the resistance is 4 ohms:

Current = Voltage ÷ Resistance

Current = 12 ÷ 4

Current = 3 amperes

This means 3 amperes of current flow through the circuit.

Might ask yourself, why we divide? Good.

Here is the reason:

Current is the amount of electricity flowing in a circuit. Resistance slows the flow, so we divide the voltage by the resistance to find how much current can pass through.

What this means physically?

Resistance limits the flow of current.

• Higher resistance → less current.

• Lower resistance → more current.

So dividing voltage by resistance tells us how much resistance can flow through the circuit.

Why Ohm’s Law Is Important?

Ohm’s Law helps engineers and scientists design electrical systems such as:

* Power supplies.

* Electronic devices.

* Household electrical circuits.

Quick Tip:

If you know any two values in Ohm’s Law, you can calculate the third.

Want to learn more about electricity and physics?