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WorksheetsElectricity in the Home and Electromagnetism
Total questions: 15
Worksheet time: 8mins
What is another way to calculate the cost of electricity used?
Cost = Power (kW) x Time (h) x Cost of 1 kWh
Cost = Voltage x Current x Cost of 1 kWh
Cost = Resistance x Time x Cost of 1 kWh
Cost = Power (W) x Time (s) x Cost of 1 kWh
What is the result when the switches are in the positions shown in the diagram?
The lamp would be off
The lamp would be on
The circuit would be complete
The current would increase
What type of switch is used beside a door to control a light?
One-way switch
Two-way switch
Three-way switch
Dimmer switch
What material are the wires in a three-pin plug coated with?
Rubber
Plastic
Metal
Wood
What is the function of the earth wire?
To conduct electricity to the device
To provide a path for current to flow to the ground
To increase voltage
To convert AC to DC
Where is the blue wire positioned in a plug?
Top
Bottom Left
Bottom Right
Center
What color is the insulation of the neutral wire in a three-pin plug?
Brown
Blue
Yellow and Green
Red
What indicates the direction of current flow in an a.c. supply?
The color of the wire
The positive and negative values
The length of the wire
The thickness of the wire
What is the angle between the direction of the force and the magnetic field?
0°
45°
90°
180°
What is the direction of the magnetic field in the worked example?
From S to N
From N to S
From E to W
From W to E
What happens when the wire cuts the magnetic field?
No current is produced
A current (voltage) is produced
Resistance is increased
The wire heats up
What happens when a magnet is moved into a coil of wire?
A current flows.
No current flows.
The coil heats up.
The magnet loses its magnetism.
Which of the following does NOT increase the size of the induced emf?
Using a stronger magnet
Using a coil with fewer turns
Moving the magnet faster
Putting a core of soft iron in the coil
What links with the secondary coil to induce a current?
A constant magnetic field.
A changing magnetic field.
A static electric field.
A direct current.
What is the function of a fuse in an electrical circuit?
To store electrical energy
To convert AC to DC
To increase current
To protect the circuit from overload
