Power of an appliance or electric circuit
Lesson 4 / 8
Lesson video
The video is not available yet.
Lesson slides
not available yet
Lesson details
Lesson outcome
I can describe how the power of an appliance or electric circuit depends on current and potential difference.
Show transcript
Power is the amount of energy transferred per second and is measured in watts (W).
Power can be calculated using the equation: power = current × potential difference (P = I V).
At a constant p.d., a larger electric current transfers energy more quickly than a smaller current.
Domestic appliances plugged into the mains supply in the UK have a p.d. of 230 V across them.
The fuse with the smallest rating for the required current (calculated using the equation: P = I² R) should be used.
Worksheet
not available yet
Quizzes
This quiz is not available yet.
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare · Not available
- Starter quizActivate · Not available
- Lesson videoLearn · Not available
- Exit quizCheck · Not available
This content is by Cashar and published under an open licence.