Lesson 4 Review

What object is a GOOD example of a resistor?

• The wire in a computer cord.

• The wire in a light bulb.

• The plastic covering a cord.

Which list names different forms of energy?

• magnetic, resistor, conductor

• sound, light, heat

• copper, battery, switch

Which pair of sentences explains what happens if the wire breaks in a light bulb?

• The wire is part of the electric circuit. The electric current will

  not flow if it breaks.

• The wire is not part of the electric circuit. The electric current

  will continue to flow, but the bulb will not light.

• The wire is not part of the electric circuit. The electric current

  will flow, but the bulb is burned out.

What is the best evidence that the source of the phone’s electric energy is a battery?

• The phone produces heat, sound, and light.

• The phone has a switch, wires, and can be opened.

• The phone produces positive and negative charges.

Which diagram shows current flowing through an electric circuit?

• 
• 
• 

When the window is closed, the switch on the electric circuit of the alarm is moved to the "off" position. When the window is opened, the switch on the electric circuit of the alarm is moved to the "on" position. Which pair of sentences describes how the system works?

• When the window is opened, it stops the flow of current in the electric circuit. Stopping the current flow changes the energy to sound energy.

• When the window is opened, it starts the flow of current in the electric circuit. Electric energy is changed into sound energy.

• When the window is closed, it stops the flow of current in the electric circuit. Mechanical energy is changed into sound energy.