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Worksheets10A Mains Electricity
Total questions: 22
Worksheet time: 1hrs 7mins
The average power of a washing machine is 2400 Watts. 2400 Watts is equal to...
0.24 kW
2.40 kW
24 kW
240 kW
Imagine the diagrams are numbered 1,2,3,4 from left to right.
Which is the symbol for a fuse?
1
2
3
4
Imagine the symbols are numbered 1,2,3,4 from left to right.
What is number 3 the symbol for?
A variable resistor
A fuse
A lamp
A fixed resistor
Identify the earth wire in this diagram.
Identify the live wire in this diagram.
Which of the following plug wires has current passing through it (in a normally functioning device)?
Earth
Live
Neutral
Conductor
Which electrical safety device is pictured here?
Insulation
Fuses
Circuit Breakers
Ring Main Circuit
Which electrical safety device is pictured here?
Insulation
Fuses
Circuit Breakers
Ring Main Circuit
Mains supply uses what type of current?
AC
DC
Series
Parallel
Batteries provide which type of current?
AC
DC
Series
Parallel
Identify which of the graphs shows AC.
Match the following units to the quantities they describe.
J
Energy
W
Power
V
Voltage
I
Current
Ω
Resistance
3.
What size of fuse would be required for an electrical appliance which has a power rating of 600W and running off UK mains voltage at 230V?
1 A
2.5 A
3 A
5 A
7.
What is the main difference between a circuit breaker and a fuse?
A circuit breaker can be used to control electrical circuits
A circuit breaker can be reset whilst a fuse needs to be replaced
A fuse can be reset whilst a circuit breaker needs to be replaced
A fuse can be used to control electrical circuits
Calculate the energy, in kJ, transferred by a 60 W bulb that is turned on for 20 seconds.
(a)
What is the potential difference of the mains electricity supply? (a) volts
What is the frequency of the mains electricity supply? (do not worry about the units here)
(a)
Stove is at 230 V
What is the amperage?
45.22 Amps
A 120 V - 20 A circuit breaker max power rating
A hot water heater rated at 2600 watts is wired to 120 V circuit. What is the amperage?
