3. Watch the circuit below. If electricity flows through the circuit, the bulbs light up. If electricity cannot flow through the circuit, the bulbs do not light up.

4. How was the electrical path or circuit opened? By removing one light bulb,the electric circuit was opened, and no light was produced.

5. And the “battery” was the source of the electrical energy, that caused the bulbs to light up.

6. So, remember, electrical energy, flowing in a circuit produces “light.”

7. Besides producing light, electricity can also produce “heat.” What is the source of electricity for the toaster to produce the “heat” that toasts the bread?

21. 2. Which of the following transforms electrical energy to heat energy? A. B. C. D.

22. Correct Answer Choice: B. toaster Electric current flows into the toaster and passes through coils that heat up. These heated coils toast the bread. The toaster changes the electricity into heat. Hint:If you see a plug, you know it needs electricity. Do you like your bagel toasted?

27. 3. One difference between an electromagnet and a bar magnet is that the magnetic field produced by an electromagnet can __ ? A. be made permanent B. be turned on and off C. have two north poles attract D. be made of materials such as wood

28. Correct Answer Choice: B. be turned on and off The magnetic field of an electromagnet is a result of the electric current in the wire. Since the electric current can be switched on and off, so can the electromagnet.

33. 4. Which of the following examples below is an energy change that is needed to listen to a radio? A. electricity to sound B. electricity to light C. electricity to heat D. electricity to motion

34. Correct Answer Choice: A. electricity to sound When the radio is plugged in, electricity is changed into sound energy that travels from the speaker to your ears.

38. In summary, electricity can flow in a circuit and can produce … -light -heat -sound -magnetic effects