Electricity

Why is copper used to make wires?

• It can conduct electricity.

• It has a high boiling point.

• It has a high melting point.

• It is shiny.

Which of the following correctly describes the electric lights in our homes?

• They consume a lot of electricity.

• They have high resistance.

• They are connected in series.

• They are connected in parallel.

How many of the following objects are good conductors of electricity?

metal spoon

rubber boots

copper wires

paper plate

glass beaker

plastic handphone casing

iron grilles

leather wallet

• 3

• 4

• 7

• 8

In order to measure current, we use ___________________.

• a wire

• a resistor

• a voltmeter

• an ammeter

Why are resistors commonly used in electrical appliances?

• To cut the flow of electricity when the current is too high.

• To increase the amount of current flowing through them.

• To obtain the correct amount of current flowing through them.

• To save electricity.

What does this symbol found in an electrical

circuit represent?

• battery

• resistor

• fuse

• lamp

What must John do to the current flowing through the lamp if John wants the lamp to be dimmer?

• Increase the current

• Decrease the current

• Stop the current

• Do nothing to the current

Four dry cells each of voltage 2.0 V are connected in series. What will be the total voltage of the four cells?

• 0 V

• 4.5 V

• 6.0 V

• 8.0 V

Which of the following is the S.I. unit for electrical resistance?

• ampere

• volts

• ohms

• ammeter

An electric tooth brush is an example of transforming

• electricity into heat

• electricity into sound energy

• electricity into motion energy

• electricity into light