Electric Circuits

Why electrical wiring usually are covered with a layer of plastic?

• To make it look pretty

• To help electricity flow along the wire

• To make it safe

• To add more energy

What needs to be done to this circuit so that the lamp lights up?

• Close the switch

• Add a source and close the switch

• Add another lamp

• Add another lamp and a switch

Why is electrical wiring usually made from copper?

• Because copper is shiny

• Because copper conducts electricity

• Because copper is not magnetic

• Because copper insulate electricity

1. Which switch or switches must be closed to make the lamps light?

• Only switch 1

• Only switch 1

• Switches 1 and 2

• Switches 1 , 2 and 3

Tammy makes a complete simple circuit with one bulb and three batteries. The bulb lights for an instant and then goes out. Why?

• Too much electricity flows through the bulb's filament

• Not enough electricity flows around the circuit

• The batteries are flat

• The batteries are not good

Which statement about electric curent is correct?

• It always flows clockwise

• It gets used as it goes around the circuit

• It flow in many directions at the same time

• It always flows from the point where the electrical potential is highest to the point where it is lowest

Peter has connected two bulbs across two batteries in a simple circuit. How can she make the bulbs dimmer?

• Replace one of the batteries with a section of wire

• Replace one of the bulbs with a section of wire

• Replace one of the batteries with a cork

• Replace the batteries for more wire

If lamp 1 is unscrewed from its holder, what will happen to lamp 2?

• It will get brighter

• It will stay the same brightness

• It will go out

• Nothing will happen

Why is a bulb brighter when it is powered by two batteries rather than one?

• Because the flow of electricity in the circuit is less

• Because the flow of electricity in the circuit is the same

• Because the flow of electricity in the circuit is greater

• Because the flow of electricity will go backward

If lamp 2 is unscrewed from its holder, what will happen to lamp1?

• It will stay lit

• It will go out

• It will get dimmer

• It will dissapear