P4 Science · Chapter 12brightbit.net/worksheets
Electrical Systems — Conductors and Insulators
Name: ______________________Class: ________Date: ____________Score: ____ / 10
- 1.
Which of the following is an electrical conductor?
(a) Rubber(b) Plastic(c) Copper wire(d) Dry wood
- 2.
Why are electrical wires covered in plastic or rubber?
(a) To make the wire stronger and prevent it from breaking(b) To insulate the wire and prevent electric shocks(c) To allow more current to flow through the wire(d) To keep the wire cool
- 3.
Which of the following materials would complete an electrical circuit and light a bulb?
(a) A piece of paper(b) An iron nail(c) A plastic ruler(d) A rubber band
- 4.
What is an electrical insulator?
(a) A material that allows electricity to flow through it easily(b) A material that does not allow electricity to flow through it(c) A component that stores electrical charge(d) A device that measures electric current
- 5.
A student tests several objects to see which ones conduct electricity. She connects each object in a circuit with a battery and a bulb. Which result shows the object is a conductor?
(a) The bulb does not light up(b) The battery gets warm(c) The bulb lights up(d) The wire gets longer
- 6.
Pure water is a poor conductor, but salt water conducts electricity well. Why?
(a) Salt water is colder than pure water(b) Salt dissolves in water to produce ions that carry electric charge(c) Salt makes water molecules move faster(d) Salt water contains more oxygen
- 7.
Which of the following is the BEST insulator?
(a) Aluminium(b) Graphite (pencil lead)(c) Glass(d) Salt water
- 8.
Why should you never touch electrical sockets or wires with wet hands?
(a) Water damages electrical components(b) Water on the skin reduces the body's resistance and increases the risk of electric shock(c) Wet hands slow down the current(d) Wet hands cause short circuits inside devices
- 9.
Give TWO examples of electrical conductors and TWO examples of electrical insulators.
- 10.
Explain why electricians wear rubber gloves when working on live wires.
Answer key — P4 Science: Electrical Systems — Conductors and Insulators
For parents. Step-by-step explanations for every question are free on brightbit.net.
- 1.(c) Copper wire
- 2.(b) To insulate the wire and prevent electric shocks
- 3.(b) An iron nail
- 4.(b) A material that does not allow electricity to flow through it
- 5.(c) The bulb lights up
- 6.(b) Salt dissolves in water to produce ions that carry electric charge
- 7.(c) Glass
- 8.(b) Water on the skin reduces the body's resistance and increases the risk of electric shock
- 9.conductors: copper and iron; insulators: rubber and plastic
- 10.rubber is an insulator so it prevents current from flowing through the electrician's body and protects them from electric shock
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