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Electricity

Electricity. Demonstrate that the flow of electricity in circuits requires a complete pate, through which an electric current can pass and can produce light, heat, and sound. Important Words to Know. Circuit A closed path through which electricity travels Electric current

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Electricity

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  1. Electricity Demonstrate that the flow of electricity in circuits requires a complete pate, through which an electric current can pass and can produce light, heat, and sound

  2. Important Words to Know Circuit A closed path through which electricity travels Electric current The movement of electricity through an electric circuit (the path). Energy Source For electricity to flow through a closed circuit, there must be an energy source, that sends out an electric current. Example: a battery

  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?

  8. For the toaster to produce heat, it needs a source of electricity . • The toaster must be plugged in to the “wall socket” to get electricity. • Electricity comes from the power plant, through wires, to the wall socket. And, the electricity is transformed (or changed) into “heat” to toast the bread!

  9. Electricity produces, light, heat, and also…“sound!” Electric current flows from the wall socket, through the wires, and in to the radio. In the radio, the electricity is transformed into “sound.”

  10. So, we know that electricity produces, light, heat, and sound. And it can also produce “magnetic effects!”HOW? Electromagnets

  11. A temporary magnet can be made by passing electric current through a wire coiled around an iron bar. Electromagnets

  12. A junkyard is one place to see an electromagnet in action. • A crane holding a huge electromagnet can be used to pick up scrap metal when current flows through it. When the crane operator wants to drop the scrap, he or she will simply shut off the current to the electromagnet. “Electromagnets”

  13. So we know that electricity can flow in a circuit and produce… light heat sound magnetic effects

  14. Let’s Review Question #1

  15. In order to watch the television below, what is the source of electricity for this circuit?

  16. If you said electricity – you are correct!

  17. Let’s Try Question #2

  18. 2. Which of the following changes electrical energy to heat energy? A. B. C. D.

  19. Correct Answer Choice: Do you like your bagel toasted? 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.

  20. Incorrect Answer Choice: NOT A. wind turbine The wind turbine transforms wind energy into electrical energy. It does not involve heat. NOT D. fire - A fire makes heat, but it does not use electrical energy to make the heat. NOT C. flashlight - A flash light changes electrical energy into light, not heat.

  21. Let’s Try Question #3

  22. 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

  23. Correct Answer Choice: 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. B. be turned on and off

  24. Incorrect Answer Choice: NOT A. be made permanent - Bar magnets stay magnetic for a long time and cannot be turned on and off. NS NOT C. have two north poles - All magnets, including electromagnets have one north pole and one south pole NOT D. attract material such as wood - Since wood is not magnetic, it will not be attracted by either a bar magnet or an electromagnet. (Iron and steel are magnetic, not wood.)

  25. And finally, Question #4

  26. 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

  27. 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.

  28. Incorrect Answer Choice: NOT B. electricity to light - A clock radio does produce light, but to hear a radio, the radio must produce sound. NOT C. electricity to heat - The question is asking what is needed to “hear a radio.” NOT D. electricity to motion - The question is asking what is needed to “hear a radio.” You don’t need to move to hear a radio.

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

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