Science G4 U13 - L5, L7

A switch in a circuit

• acts as an insulator.

• keeps the flow of electricity at a safe level.

• allows or stops the flow of electricity.

• absorbs electricity.

When the flow of an electric current only travels in one direction is called

• alternating  current.

• electromagnetic current.

• direct current.

• voltage.

Which of the following are used for reading glasses to make objects nearby appear bigger?

• concave lenses

• glass prisms

• convex lenses

• mirrored  lenses

How are a fuse box and  a  circuit breaker similar?

• They both control if a circuit is series or parallel.

• They both control static discharges.

• They both determine how much current should flow.

• They both open a circuit if too much current is flowing.

Sounds travels most quickly through

• liquids, such as water.

• gases, such as air.

• solids, such as wood.

• a vacuum, which is empty.

Electric motors change

• chemical energy into mechanical energy.

• mechanical energy into electrical energy.

• mechanical energy into magnetic energy.

• electrical energy into mechanical energy.

A set of angled blades attached to a shaft that provides mechanical energy for a generator is called

• a turbine.

• a gear.

• a motor.

• an electromagnet.

A(n) ____________ can separate white light into bands of colored light.

Energy travels from the Sun to Earth by ____________.  

When sound is reflected off a surface it is called a(n) ____________.