WorksheetsForm 3 Chapter 6: Electric and Magnetism
Total questions: 10
Worksheet time: 7mins
Which of the following is a non-renewable energy source?
Firewood
Radioactive substance
Sun
Biomass
Which power station uses firewood as the energy source?
Nuclear
Thermal
Hydroelectric
Biomass
What is the energy change that occurs in a thermal generator?
Gravitational potential energy --> kinetic energy --> electrical energy
Chemical energy --> heat energy --> electrical energy
Chemical energy --> heat energy --> kinetic energy --> electrical energy
Nuclear energy --> heat energy --> kinetic energy --> electrical energy
Which of the following is true about direct current?
Generated in the power station
Flows in two directions
Its voltage can be increased and decreased
Produced by a solar cell
The diagram shows a transformer connected to a 5-volt power supply. Predict the value of the output voltage of the transformer.
5 V
7 V
Less than 5 V
More than 5 V
This diagram shows the transmission and distribution system of electrical energy. Among transformers W, X, Y and Z, which are step-down transformers?
W and Y only
Y and Z only
W, X and Y only
X, Y and Z only
The diagram shows a 3-pin plug. Which of the following shows the correct international colour code for wire P, Q and R?
P - green
Q - blue
R - red
Pak Ali built a house for his family. When fixing the electrical wires and cables neglected the earth wire. What is the consequence of this neglect?
Power supply will always break down.
The value of input voltage will be lower.
The electricity bill will become higher.
The household appliances will become damaged when lightning.
Which fuse is suitable for a heater with power of 1500 W that uses 240 V supply?
Fuse 3 A
Fuse 5 A
Fuse 10 A
Fuse 13 A
The table shows the usage of three electrical appliances in a day. Calculate the total cost of energy used in 30 days if the cost of one unit is 20 cents.
RM 3.55
RM 7.10
RM 10.65
RM 21.30
