Circuits

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Circuits Switches
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Circuits

• An Electric Circuit is an uninterrupted
  conducting path for an electric current.
• In order for electrons to flow and do work, there
  must be a complete pathway through which they can
  move.

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Closed Circuit

• When there is a flow of electrons the circuit is
  said to be closed

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Open Circuit

• When the flow is interrupted and the electrons
  cannot move through the circuit, the circuit is
  said to be open.

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Circuits

• A practical way to open and close a circuit is a
  switch
• An electrical circuit can be regarded as a system.

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Circuits

• Within this system there may be four subsystems
• Source ? The part that changes some other
  form of energy into electrical energy
• Conductor ? A material that allows electric
  current to pass through it easily
• Control ?The part by which the circuit is open
  or closed (usually a switch)
• Load ?The part that changes electrical
  energy into some other form of energy

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Series Circuit

• In a series circuit the electrons flow through
  each device along a single connecting path.
• The removal of one bulb interrupts the path of
  electricity through the circuit.

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Parallel Circuit

• In a parallel circuit the electrons can flow
  through two or move alternative paths.
• If one bulb is removed, the circuit still remains
  closed.

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Circuit Diagrams

• Standard symbols are used to represent each part
  of a circuit.

Galvanometer
Motor
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Circuit Diagrams