Lesson: Ohm’s Law

In this lesson, we will learn how to use the formula V = IR (Ohm's Law) to work out the values of the potential difference, current, and resistance in simple circuits.

Video

12:58

Sample Question Videos

02:43
01:16
01:25

Worksheet: 21 Questions • 5 Videos

Q1:

A resistor in a circuit has a potential difference of 20 V across it. The current through the resistor is 0.4 mA. What is the resistance of the resistor?

Q2:

Which of the following is the correct unit for potential difference?

Q3:

How many volts are there in 20 kilovolts?

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