Science L2 conductors and insulators

What is also known as potential difference?

• Current

• Resistance

• Voltage

• Power

What is the conductance ability of a conductor?

• Low

• Medium

• High

• Zero

What is the primary characteristic of a conductor that allows it to conduct electricity well?

• High resistivity

• High conductance

• Low temperature coefficient

• Low number of free electrons

How does a conductor respond to an applied EMF?

• It becomes an insulator

• It generates heat

• It conducts electricity

• It stops conducting

Why is gold used in electrical circuits and cables?

• It is a good conductor of electricity.

• It is inexpensive.

• It has high resistance towards corrosion.

• It is lightweight.

What is one advantage of using aluminium cables in overhead lines?

• They are cheaper than copper cables.

• They are lighter than copper cables.

• They are more conductive than copper cables.

• They are more durable than copper cables.

What component works with carbon brushes in DC motors?

• Rotor

• Stator

• Commutator

• Armature

What is the main function of carbon brushes in electrical machines?

• To insulate the machine

• To conduct electricity

• To cool the machine

• To lubricate moving parts

In which part of the motor are carbon brushes typically located?

• Rotor

• Stator

• Commutator

• Shaft

Which property of carbon makes it suitable for use in brushes?

• High melting point

• Low density

• High conductivity

• Negative temperature coefficient