WJEC GCSE Physics Unit 1.4 - Domestic Electricity

Question 1

Which of these is not a wire in the normal 3 pin plug?

Accepted Answer

Cross Wire

Question 2

How many minutes are there in 4 hours?

Accepted Answer

240

Question 3

If installing photovoltaic panels costs £4,000 and saves £400 per year, find the payback time.

Accepted Answer

10 years

Question 4

Which fuse should be selected for a device which requires a current of 4A?

Accepted Answer

5A

Question 5

Which of these transfers the most energy?

Accepted Answer

A 2kw device operating for 120 minutes

Question 6

Which wire in the plug is usually brown in colour?

Accepted Answer

Live

Question 7

A TV has an energy efficiency rating of 75. Which efficiency band does it sit in?

Accepted Answer

C

Question 8

Which of these safety devices detect a difference in the current in the live and neutral wires?

Accepted Answer

RCCB

Question 9

Into which wire are switches always placed?

Accepted Answer

Live

Question 10

Which of these factors does not affect the payback time for photovoltaic panels?

Accepted Answer

How much wind there is

Question 11

How many Watts is 1kW equivalent to?

Accepted Answer

1,000

Question 12

Look at the diagram and determine which bulb is the most cost efficient.

Accepted Answer

12 watt LED

Question 13

Which of these is not an advantage of the 'ring-main'

Accepted Answer

There are more routes for the current if there's a fault

Question 14

What is the frequency of the mains supply in the UK?

Accepted Answer

50Hz

Question 15

Which wire is always connected to the fuse in the plug?

Accepted Answer

Live

Question 16

What name is given to a current which constantly changes direction?

Accepted Answer

Alternating current

Question 17

How many joules is 1kwh equivalent to?

Accepted Answer

3,600,000

Question 18

If the red line shows the mains voltage supply. What is the 'peak voltage' received?

Accepted Answer

Approx 300V

Question 19

A kettle has a power of 2.5kw. How many watts is this equivalent to?

Accepted Answer

2,500

Question 20

True or false: Batteries supply an alternating current

Accepted Answer

False

Questions 20