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ELECTRIC CIRCUITS 20.2

ELECTRIC CIRCUITS 20.2. Chapter Twenty: Electric Circuits. 20.1 Charge 20.2 Electric Circuits 20.3 Current and Voltage 20.4 Resistance and Ohm’s Law. Chapter 20.2 Learning Goals. Define electricity. Describe the components of an electric circuit.

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ELECTRIC CIRCUITS 20.2

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  1. ELECTRIC CIRCUITS 20.2

  2. Chapter Twenty: Electric Circuits • 20.1 Charge • 20.2 Electric Circuits • 20.3 Current and Voltage • 20.4 Resistance and Ohm’s Law

  3. Chapter 20.2 Learning Goals • Define electricity. • Describe the components of an electric circuit. • Explain the difference between a closed circuit and an open circuit.

  4. 20.2 Electric current • Electric current is caused by moving electric charge. • Electric current comes from the motion of electrons. current

  5. 20.2 Electric current • Electric current is similar in some ways to a current of water. • Like electric current, water current can carry energy and do work. • A waterwheel turns when a current of water exerts a force on it.

  6. 20.2 Electric Circuits • An electric circuit is a complete path through which electric current travels. • A good example of a circuit is the one found in an electric toaster.

  7. 20.2 Electric Circuits • Wires in electric circuits are similar in some ways to pipes and hoses that carry water.

  8. 20.2 Electric Circuits • When drawing a circuit diagram, symbols are used to represent each part of the circuit.

  9. 20.2 Electric Circuits • Electrical symbols are quicker and easier to draw than realistic pictures of the components.

  10. 20.2 Resistors • A resistor is an electrical device that uses the energy carried by electric current in a specific way. • Any electrical device that uses energy can be shown with a resistor symbol.

  11. 20.2 Current in a circuit • Current only flows when there is a complete and unbroken path, or a closed circuit. • Flipping a switch to the “off” position creates an open circuit by making a break in the wire.

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