Mains Electricity Flashcards

1

The fuse will break if...

the power is too high
the current is too high
the voltage is too high
then resistance is too high

2

In the UK mains electricity runs at what voltage?

230 V
350 V
210 V
140 V

3

If an extension lead has a 30 A fuse what combination of appliances would break the fuse?

Toaster, Kettle & Hoover
Hair Dryer, Kettle, Laptop Charger & Mobile Phone Charger
Hairdryer, Laptop Charger, Phone Charger, Toaster & Hoover
Toaster, Hoover & Hair Dryer

4

What colours are the wires in a UK plug?

Blue, Yellow-Green and Brown
Red, Black and Green
Red, Yellow and Blue
Yellow-Green, Brown and Black

5

If an alternating current has a frequency of 25 Hz, what is the time period?

2.5 ms
250 ms
400 ms
40 ms

6

Which part of the plug is a safety feature?

Indifferent
Moon
Earth
Neutral

7

What is the peak voltage in the blue wire?

230 V
120 V
240 V
0 V

8

What does AC stand for?

Alternating Current
A bit different current
Alternate current
Alternative Current

9

If an appliance requires 8.1 A of current, what fuse should it use?

5 A
3 A
13 A
8 A

10

If mains electricity runs at 50 Hz, what is the time period of one cycle?

2 seconds
0.02 seconds
0.05 seconds
50 seconds

11

If the current is too high...

the metal wire in the fuse melts breaking the circuit.
the metal wire in the fuse burns breaking the circuit.
the metal wire in the fuse swells increasing resistance
the fuse tells the current "You shall not pass!"

12

What is the peak voltage in the brown wire?

0 V
230 V
120 V
240 V

13

What colour is the UK earth?

Yellow
Yellow-Green
Green
Blue-Black

14

Fuses contain a thin piece of metal with what property?

High flexibility
High resistance
Crystalline structure
Low melting point

15

What frequency does mains electricity have?

20,000 Hz
150 Hz
50 s
50 Hz

Mains Electricity

Questions 15

Mains Electricity

Questions 15