Electricity and Circuits Quiz

Which of the following is a device designed to open a circuit containing too much current in order to prevent overheating?

• resistor

• battery

• circuit breaker

• transformer

In most electric power plants, magnets are moved through a coil of wire. This causes current to flow through the wire. The device that does this is called a(n)

• electric amplifier

• series circuit

• electric generator

• electric motor

Tim and Sam build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Tim and Sam do to increase the number of paper clips their electromagnet picks up?

• Make the wire shorter.

• Increase the size of the iron core.

• Remove the nail from the center of the wire.

• Spread the loops of wire apart on the nail so they do not touch.

Opposition to the flow of electricity is called _____.

• voltage

• current

• resistance

• conduction

A material through which electrons do not readily flow is a(n) _____.

• transformer

• insulator

• conductor

• fuse

A circuit that has two or more separate branches for current is a _____.

• series circuit

• electron circuit

• parallel circuit

• circuit diagram

Which of the following statements best describes an electric generator?

• An electrical current causes a coil of wire to rotate in a magnetic field.

• Electric potential in a rotating coil of wire creates a permanent magnet.

• A magnet is rotated through a coil of wire to produce an electric current.

• Forces from a permanent magnet allow a coil of wire to rotate.

Where is the magnetic force exerted by a magnet the strongest?

• both poles

• south pole

• north pole

• center

Which energy transformation occurs in an electric motor?

• electrical to mechanical energy

• mechanical to electrical energy

• thermal to wind energy

• wind energy to electrical energy

What happens to the magnetic force as the distance between two magnetic poles decreases?

• remains constant

• increases

• decreases

• decreases then increases