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WorksheetsElectrical Science revision
Total questions: 34
Worksheet time: 3hrs 50mins
An ohmmeter takes five readings on a circuit: 0.24Ω, 0.79Ω, 0.26Ω, 0.35Ω, 0.56Ω. What is the ‘range’ of the readings?
0.55Ω
0.79Ω
0.24Ω
2.16Ω
Rearrange the following formula to make ‘c’ the subject:
a2 = b2 + c2
The SI unit m2 is used for what measurement?
Volume
Mean area
Area
Mass
What are the SI base units for volume and temperature?
m3 , oC
m3 , oK
m2 , oC
m2 , oK
Which instrument would be used to measure Power?
Ohm meter
Volt meter
Watt meter
Amp meter
Instrument B in the circuit shown would measure:
the voltage across R1
the current through R3
the current through R1
the voltage across R3.
An industrial motor has a mass of 500kg at sea level. What is the mass of the motor when it is taken 1000m above sea level?
5000kg
4.9kN
5000N
500kg
A wheel barrow is an example of a:
Class 1 lever
Class 2 lever
Class 3 lever
Class 4 lever
The power required to raise a mass of 8kg across a distance of 10m in 40 seconds is approximately:
785W
80W
20W
5W
Which one of the following correctly defines force?
It is the effect of gravity on a mass measured in Newtons
It is the effect of distance on gravity measured in metres per second
It is the effect of distance on mass measured in coulombs.
It is the effect of weight over time measured in watts
One set of gears are connected together. The smaller cog has 12 teeth and the larger cog has 20 teeth. The smaller cog rotates 40 timesper second. How many times per second will the larger cog rotate?
24 times per second
67 times per second
58 times per second
87 times per second
Two pulleys are used to lift a load of 19000 Newton’s, 4 metres above a surface. How much effort would be required to lift the load?
4750 Newton’s
9500 Newton’s
76000 Newton’s
38000 Newton’s
In order for the lever in the diagram shown to remain balanced, the weight marked X would need to be:
20 kg
10 kg
8 kg
4 kg
Which one of the following identifies the sources of an electromotive force?
Atomic, magnetic, thermal
Chemical, atomic, thermal
Chemical, magnetic, thermal
Chemical, magnetic, atomic
When the current passing through a conductor is increased, the conductor’s temperature will:
decrease
stabilise
fragment
increase
Which one of the following describes the effect used by a cell or battery?
Thermal
Chemical
Induction
Magnetic
Electric current is described as a flow of:
protons
neutrons
electrons
neutrinos
If a d.c. circuit having two 15Ω resistors connected in series had a supply voltage of 60V, the current in the circuit would be:
8 A
4 A
2 A
1 A
If the resistivity of aluminium is 2.65 x 10-8 Ω/metre, the resistance of a 65 metre length of 16mm2 aluminium conductor is
10.77Ω
1.108Ω
0.0108Ω
0.108Ω
For the circuit shown, the total resistance is:
108Ω
36Ω
12Ω
3.6Ω
If a d.c. circuit having two 15Ω resistors connected in series had a supply voltage of 60V, the current in the circuit would be:
8 A
4 A
2 A
1 A
For the circuit shown, the power dissipated by the 15Ω resistor is:
240 W
60 W
160 W
40 W
What is the length of a 1.5 mm2 copper conductor if it has a measured resistance of 0.22 Ω at 20 0C, using the formula shown?
The resistivity of copper (P) is 0.0172 micro-ohms-metre.
19.2 m
36.6 m
82.3 m
94.4 m
If a circuit had three resistors in parallel, each having a resistance of 30 Ω, the total resistance would be:
90 Ω
60 Ω
30 Ω
10 Ω
If 400V supplied to a circuit that draws 14A, what is the power being consumed by the circuit?
5.6kW
28.57W
0.035W
56kW
What is the resistance of a circuit if the current drawn from a 400V supply is 17.3A?
23.12 Ω
0.043 Ω
2.3 Ω
4.3 Ω
What application is mineral insulated cable particularly suitable for?
Fire alarm cable
Connections to motors
Domestic sockets
Domestic lighting
4 × 5Ω resistors are connected in series. What is the voltage drop across the first resistor if the supply is 115V?
28.75 V
23 V
0 V
115 V
Which one of the following shows the correct poles of the electromagnet when current flows in the direction shown?
a)
b)
c)
d)
What would be the effect on magnetic flux for the two equal, current-carrying conductors shown?
The magnetic field would halve in strength, flowing in opposite directions
The magnetic fields around each of the conductors would rotate independently
The magnetic fields around the conductors would cancel each other out
The magnetic field around the conductors would double in strength and flow in the same direction
A conductor of a simple alternator is 0.4m long and cuts a magnetic field with a magnetic flux density of 1.5 tesla at a velocity of 30m/s. The EMF induced in the conductor will be:
1800 V
180 V
18 V
1.8 V
Which one of the following shows the correct pattern for magnetic flux around the current carrying conductor?:
a)
b)
c)
d)
Identify where the South Pole would be on this solenoid
A
B
C
D
A current carrying conductor is placed within a magnetic field. Which direction will the conductor (in the fig) move?
Left
Right
Down
up
