The National Grid and mains electricity - OCR Gateway test questions - OCR Gateway

1

What is the name of the system that transports electricity across the UK?

2

What does a step-up transformer do?

3

How is electricity transported across the UK?

4

A step-down transformer is used to do which of the following?

5

What is the power output of a mains transformer with a current of 0.2 A flowing through it?

6

The power input into a transformer of 100% efficiency is 2,000 W. What will the power output be?

7

The power input of a transformer is 1,200 W and the output voltage is 120 V. What will the output current be?

8

What is the frequency and size of the UK mains voltage?

9

Which of the following are the correct voltages between the wires in a UK plug?

10

Which of the following are safety devices used in a plug or an appliance?