**Ohm’s law equation** describes the relationship between **voltage** (V), **current** (I) and **resistance** (R). Here’s the equation of ohm’s law: **V = I × R**

Let’s solve some problems based on this equation, so you’ll get a clear idea.

## Ohm’s Law Practice Problems

**Problem 1:** Calculate the current flowing through an electronic device which has a resistance of 4 Ω and the voltage of 8 V.

Solution:

Given data:

Current, I = ?

Resistance, R = 4 Ω

Voltage, V = 8 V

Using the equation of ohm’s law,

V = I × R

8 = I × 4

I = 2 A

Therefore, the current flowing through an electronic device is **2 A**.

**Problem 2:** A 5 A current is flowing through a 15 Ω resistor. Calculate the voltage across a resistor.

Solution:

Given data:

Current, I = 5 A

Resistance, R = 15 Ω

Voltage, V = ?

Using the equation of ohm’s law,

V = I × R

V = 5 × 15

V = 75 V

Therefore, the voltage across a resistor is **75 V**.

**Problem 3:** An electric circuit has a voltage of 5 V and a current of 10 A. Calculate the resistance of an electric circuit.

Solution:

Given data:

Voltage, V = 5 V

Current, I = 10 A

Resistance, R = ?

Using the equation of ohm’s law,

V = I × R

5 = 10 × R

R = 0.5 Ω

Therefore, the resistance of an electric circuit is **0.5 Ω**.

**Problem 4:** What is the electric current flowing through a 12 Ω resistor with a voltage of 60 V?

Solution:

Given data:

Current, I = ?

Resistance, R = 12 Ω

Voltage, V = 60 V

Using the equation of ohm’s law,

V = I × R

60 = I × 12

I = 5 A

Therefore, the electric current flowing through a resistor is **5 A**.

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