Practice Ohm's Law in Physics

Use these practice problems to test your method after reviewing the concept explanation and worked examples.

Quick Recap

The relationship stating that voltage across a conductor equals the current through it multiplied by its resistance.

More push (voltage) means more flow (current). More resistance means less flow for the same push.

Example 1

easy
A 12 \text{ V} battery is connected to a 4 \text{ } \Omega resistor. What current flows?

Example 2

medium
A heater draws 5 \text{ A} from a 240 \text{ V} supply. What is its resistance, and how much power does it consume?

Example 3

medium
What voltage is needed to push 0.25 \text{ A} through a 100 \text{ } \Omega resistor?

Example 4

medium
A resistor in a circuit has a current of 0.5 \text{ A} flowing through it when connected to a 6 \text{ V} supply. (a) What is its resistance? (b) If the voltage is doubled to 12 \text{ V}, what is the new current (assuming constant resistance)?
← Back to Ohm's Law Worked Examples Formula Explained