Electrical Symbols

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Electrical Symbols
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Electrical Circuit Symbols

• are a short- form convenience used in circuit
  diagrams to represent each of the components of a
  circuit.
• Note always use a ruler for drawing circuit
  diagrams. Diagrams are generally either
  square-shaped or rectangular.

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Connecting Wires
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Light Bulb
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• Closed switch

• Open switch

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Battery

• The longer line represents the positive terminal
  and the shorter end the negative terminal.
• The number of sets of long/short lines represents
  the number of cells in the battery. Example the
  battery below has 5 cells.

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• Two-cell battery

• Single cell battery

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Alternating Current

• This is the type of current that flows through
  your house. It alternates direction.

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Resistor or Load

• Resistors are used to slow the current.
• Too much current can damage electrical
  appliances.
• The stripes on the resistor indicate the amount
  of resistance provided by this particular
  resistor.

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Loads
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Ground Connector

• Prevents electrical shock from current leaking
  into uninsulated parts of an appliance etc.

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Fuse

• A fuse is a thin piece of metal that will melt if
  the current is too high, thereby protecting the
  circuit.

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Voltmeter

• A voltmeter measures the difference in electric
  potential energy between two points in a circuit.

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Ammeter

• An ammeter measures the current

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Motor
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Practice Problems

• Page 461 of ON Science 9, questions 3 and 5