year 4 electricity revision

Which of these materials is a good conductor of electricity?

• Rubber

• Metal

• Newspaper

• Glass

Which of the following items would conduct electricity?

• Aluminum ladder

• Metal screwdriver

• Wooden baseball bat

• Rubber flip flops

A science class was completing an experiment on electrical circuits. Why did the bulb go out each time the switch was opened?

• Opening the switch broke the circuit

• The battery was probably going flat

• There was too much electricity flowing

• Opening the switch closed the circuit

Many electrical wires are wrapped with a plastic coating because plastic is -

• More dense than copper

• Able to keep its shape

• Less expensive than steel

• A good insulator

• Motor
• Mouse
• Ground
• Fuse

• Battery
• Fuse
• Diode
• Switch (open)

Material that electricity can easily flow through

• Insulators
• Rubber
• Conductor
• Wood

A device for opening or closing the flow in a circuit is _______.

• an insulator
• a battery charger
• a switch

What is the energy source for a circuit?

• Light bulb
• Battery
• Wire
• Switch

What is it called when a circuit is complete?

• Closed circuit
• Light bulb circuit
• Open circuit
• Series circuit