Electricity Quiz 1

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Electricity Quiz 1
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Question 1
Volts (V)
What are the units of electric current ?
Amps (A)
Watts (W)
?
Joules (J)
Help !
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Question 2
Joules
Power is measured in units called
Kilowatt hours
Watts
?
Newtons
Help !
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Question 3
10 W
How many watts are there in one kW (kilowatt) ?
100 W
1000 W
?
10000W
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Question 4
2.4 kW
2400 W is the same as
24 kW
240 kW
?
0.24 kW
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Question 5
50 V
What is the voltage of the mains electricity
supply ?
230 V
12 V
?
460 V
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Question 6
4800 units
How many units of electricity are used when a
2400 W heater is turned on for 2 hours ?
2400 units
2.4 units
?
4.8 units
Help !
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Question 7
1.23
If a kettle uses 2.2 units of electricity in a
day, and each unit costs 8p, how much does it
cost in one week ?
12.30
17.6 p
?
17.60
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Question 8
12221.4
12232.4
How many units does this meter show ?
122314
?
12231.4
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Question 9
6423
642.3
These two meter readings were taken 1 month
apart. How many units of electricity were used in
that month ?
643.4
?
442.6
Help !
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Question 10
1 A
3 A
If the current normally flowing in this food
mixer is 3A, what is the best fuse to fit ?
5 A
?
13 A
Help !
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Question 1 Help Screen
The term current describes how much electricity
flows in a certain time. The units are named
after scientist André Ampère
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Question 2 Help Screen
Power measures the rate at which we use
energy. The units are named after the scientist
James Watt
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Question 3 Help Screen
In our system of units the word kilo before any
other unit always means 1000.
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Question 4 Help Screen
To change Watts to kiloWatts you must divide by
1000. So 2400 1000
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Question 5 Help Screen
This means the voltage that we get at a normal
household power socket. This is high enough to
kill you.
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Question 6 Help Screen
To calculate the units of energy used, use the
formula Units used Power x time The power
must be in kW and the time must be in hours So
change the power to kW and multiply by the time.
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Question 7 Help Screen
First work out the cost for one day. Remember
that each unit costs 8p and the kettle has used
2.2 units. Then work out the cost for one week,
by multiplying by 7.
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Question 8 Help Screen
Simply read the numbers off the meter, but
remember that the last digit is tenths of a unit,
so this number comes after the point.
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Question 9 Help Screen
Remember that meters cannot be reset, so to find
the number of units used, subtract the first
reading from the second reading. Remember the
digit in the red box comes after the decimal
point.
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Question 10 Help Screen
A fuse is a safety device, it should melt and cut
the power off as soon as the current rises a
little above its normal value.
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