electrical circuits. what is an electric current? electric current - a flow of electrons from the...
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ELECTRICAL CIRCUITS
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What is an electric current?
• Electric Current - a flow of electrons from the (+) terminal to the (-) terminal of a cell/battery through wires and components
+-
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Open and Closed Circuits• Open circuit = switch is open =
no current is flowing = bulb does not light
• Closed circuit = switch is closed = current is flowing = bulb lights up
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Circuit Diagram
Cell/Battery
Switch
BulbWires
Resistor in a bulb
Resistor
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Circuit Diagram
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Types of Circuits
• Series Circuits – current takes only one path and is the same at all the points
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Series Circuits• If one bulb blows out, it breaks
the circuit and all the bulbs go out
• If you add more cells/batteries to a series circuit, the bulbs burn brighter
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Types of Circuits
• Parallel Circuits – current takes more than one path and is NOT the same at all the points
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Parallel Circuits• If one bulb blows out, there is
still another complete circuit for the bulb to stay lit
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Conductors and Insulators• Conductors – objects in which
electrical current easily passes through such as metals
• Insulators – objects that resist the flow of electrical current such as plastic, wood, paper, and rubber
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Conductor or Insulator?
Conductor
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Brighter or Dimmer?
Brighter
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Series or Parallel?
Parallel
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Series or Parallel?
Series
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Series or Parallel?
Parallel
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B
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A - Resistor
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B - Switch
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C - Bulb
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D – Wire
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E - Cell/Battery
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A – Parallel
B – Series