Unit 3: Power - Revise This Topic in Four Simple Steps

Here is a list of important points that you should know:

- Define power.
- What is its unit?
- How to calculate the power of devices and personal power.
- Understand and explain how to calculate percentage efficiency.

If you feel you need to revise any of these areas, use the “Learn it” material in Step 2.

Use these notes to help you easily understand the topic:
- Definition of power
- To measure personal power
- Percentage efficiency
- Interactivity: Efficiency demonstration

Click here for a test .

Click here to go to the revisions summary. Print it out and keep it to revise later.