1.
An electric bulb is rated 120 W and 240 V. Determine the current it draws from the mains.
0.5 A
0.6 A
1.0 A
2.0 A
2.
Two resistors each 5 Ω are connected in parallel. Determine their effective resistance.
2.5 Ω
6.4 Ω
10.0 Ω
25.0 Ω
3.
An electric heater rated 60 W is connected to 240 V mains. Determine the current in its filament.
0.25 A
4.00 A
1440.00 A
60.00 A
4.
Which of the following statements about resistors connected in parallel is correct? The total resistance is
the addition of the resistance.
less than any one of them.
equal to the greatest resistance.
greater than any one of them.
5.
An electrical component that is used to vary electric current is the
ammeter.
voltmeter.
rheostat.
amplifier.
6.
The potential difference across the terminals of a resistor is 24 V.
Determine the current which will flow through the resistor with resistance 15 Ω.
40.0 A
1.6 A
10.0 A
0.6 A
7.
An electric appliance is rated 60 W. This means the appliance
runs on a main voltage of 60 V.
uses a current of 60 A per second.
uses 60 J of energy every second.
has a resistance of 60 W.
8.
An electric bulb is rated 120 W and 240 V. Determine the current it draws from the mains.
0.5 A
0.6 A
1.0 A
2.0 A
9.
An electric heater rated 60 W is connected to 240 V mains. Determine the current in its filament.
0.25 A
4.00 A
1440.00 A
60.00 A
10.
The potential difference across the terminals of a resistor is 24 V.
Determine the current which will flow through the resistor with resistance 15 Ω.
40.0 A
1.6 A
10.0 A
0.6 A
11.
In a step-down transformer,
there are more turns in the secondary coil than in the primary.
the current in the primary coil is more than the current in the secondary coil.
the voltage of the secondary coil is higher than that of the primary.
there are more turns in the primary coil than in the secondary.
12.
A series circuit consists of three resistors with values of 12 Ω, 27 Ω, and 33 Ω. The total resistance is:
12 Ω
24 Ω
33 Ω
72 Ω
13.
An electric appliance is rated 60 W. This means the appliance
runs on a main voltage of 60 V.
uses a current of 60 A per second.
uses 60 J of energy every second.
has a resistance of 60 W.
14.
An electric kettle rated 1.5 kW operates at 200 V. Determine the current passing through the kettle.
7.5 A
133.3 A
201.5 A
300.0 A
15.
The diagram below is an electrical circuit showing two resistors connected in parallel. Determine the effective resistance of the combination.
1.20 Ω
0.83 Ω
5.00 Ω
6.00 Ω
16.
A device which converts chemical energy to electrical energy is
resistor
cell
bulb
voltmeter
17.
Quantity of electricity is measured in
ampere.
coulomb.
volt.
watt.
18.
A step-up transformer has
I. more turns in the secondary coil than in the primary coil.
II. more turns in the primary coil than the secondary coil.
III. has higher voltage in the output than in the input.
I and II only
I and III only
II and III only
I, II and III
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