# Electricity Quiz

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### Quiz Questions

• 1.
1. What is the frequency of the mains electricity supply in the UK?
• A.
40Hz
• B.
50Hz
• C.
60Hz
• D.
70Hz
• 2.
2. Give an advantage of using a RCCB to switch off a circuit rather than a fuse.
• A.
Fast acting and can be reset
• B.
Slower acting but can be reset
• C.
Fast acting but cannot be reset
• D.
Cheaper
• 3.
3. How does an increase in temperature affect a thermistor?
• A.
Increase in temperature decreases the current
• B.
Increase in temperature increases resistance of thermistor
• C.
Decrease in temperature increases the current
• D.
Increase in temperature decreases resistance of thermistor
• 4.
4. What is the difference between ac (alternating current) and dc (direct current)?
• A.
ac flows in one direction, dc changes direction twice per cycle
• B.
dc is much more powerful than ac
• C.
ac is much more powerful than dc
• D.
dc flows in one direction, ac changes direction twice per cycle
• 5.
5. How does a fuse and earth wire protect against an electric shock, in a faulty metal kettle, where the metal casing becomes live?
• A.
A current flows through the fuse to the earth wire safely discharging it.
• B.
A current flows from the live wire to the earth wire and this current causes the fuse to melt
• C.
A high voltage will cause the fuse to melt and excess charge flows through the earth wire.
• D.
A low current but high voltage makes the fuse break and flow through the earth.
• 6.
6. Define electric current
• A.
Flow of charge
• B.
Push given by the cells
• C.
Pure energy
• D.
Charge per second
• 7.
7. Define potential difference
• A.
The flow of electrons in a circuit
• B.
The force of electrons in a circuit
• C.
Energy transferred per coulomb of charge
• D.
The power of the charge per second
• 8.
8. Explain why it is a good idea for electricians to wear boots with rubber soles.
• A.
Rubber is a good insulator and it increases the overall resistance so gives a smaller shock
• B.
Rubber is a good shock absorber which allows the current to flow through it.
• C.
Rubber has excellent grip which allows them to keep not to slip in the wet
• D.
Rubber is a good conductor but only towards earth hence stopping electrical shocks
• 9.
9.  Define double insulated.
• A.
The case of the plug is made of extra thick plastic which is an excellent insulator and stops electric shocks.
• B.
The case of an appliance is made of plastic and there is no connection between the inner and outer insulated parts of the appliance.
• C.
The case of the plug and the wires inside are insulated
• D.
The wires have to layers of plastic insulation to reduce the risk of shocks.
• 10.
10. What is the mains p.d. in the UK?
• A.
220V
• B.
230V
• C.
240V
• D.
250V
• 11.
11. What are the colours of the live, earth and neutral wire inside a 3 pin plug?
• A.
Live is yellow, earth is green and blue and neutral is brown
• B.
Live is red, earth is brown and green and neutral is yellow
• C.
Live is brown, earth is blue and green and neutral is yellow
• D.
Live is brown, earth is yellow and green and neutral is blue
• 12.
12. How does the resistance of an LDR change with light intensity?
• A.
The lower the light intensity the lower the resistance
• B.
The higher the light intensity the lower the voltage
• C.
The higher the light intensity the lower the resistance
• D.
The lower the light intensity the lower the voltage
• 13.
13.  Which one is a current-voltage graph for a diode?
• 14.
14. Which one is a current-voltage graph for a filament lamp?
• 15.
15. Which one is a current-voltage graph for a metal wire?

• 1.
Result 1