Electricity

In an electrical wire, the copper core is a ........................... and the two plastic covers are ............................. (ANS form: A, B)

What are the safe ways to work with electricity?

• Turn off mains electricity before fixing exposed parts

• use exposed cables and broken plugs

• Keep electrical appliances out of wet places

• put your finger in a socket

• not overload an electrical outlet

What is a switch's function in a circuit?

• to make the current hotter or colder
• turn on and off the flow of current
• the pathway that current flows
• to add more power to the circuit

Is the circuit pictured complete or incomplete? 

• Complete
• Incomplete

Which of the following is an insulator?

• an eraser

• a wire

• a penny

• a metal spoon

Which of the following is a conductor?

• wood

• rubber

• metal

• plastic

Imagine you are creating a circuit. It works and the light bulb turns on. Then you add a piece of plastic to the circuit, and the light bulb does not turn on. We can infer that the plastic is

• an insulator

• a conductor

• an electron

• static electricity

If the light bulb turns ON in a circuit, that means the circuit is

• open

• closed

Identify the conductor below.

• cloth rag
• plastic bottle
• gold ring

Tasha tested several items to see if they could conduct electricity.  Her data is shown below. What is the best claim she could make from her data?

• Wood is an insulator.
• Metal is an insulator.
• Keys are insulators.
• Toothpicks are conductors.