Lesson: Chapter 10 — Power and energy in electrical appliances

Putting the chapter together 3 of 3 Reset answers

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Question 3

Why is an immersion heater fitted with a three-pin plug?

A Because it has no fuse B So its metal case is earthed C To use less power D To make it heat faster

The right answer is the one marked above.

So its metal case is earthed. A leak to the case then flows to earth and trips the RCCB.

Answer the question to continue.