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Physics / Electrical Power and Household Circuits

Physics / Electrical Power and Household Circuits

Do you know how electricity reaches your homes? Electricity from power station comes by two wires, live wire and neutral wire. Household circuit consists of three wires: live wire (red in color ), neutral wire (black), earth wire (green ).Earth wire is used for safety purposes, any current leaked into appliances flows harmlessly to earth.
When an electric current is passed through a metallic wire, the wire gets heated up. Why the wire gets heated up? This is due to heating effect of electric current.

The amount of heat produced in the wire depends on three factors

  1. The amount of current passing through the wire
  2. The resistance of the wire
  3. The time for which current is passed in the wire

Learn about different applications of heating effect.
Learn to save electrical appliances from excessive current by using electric fuse.

Current can rise due to following reasons :

  • Overloading (too many higher power appliances turned on)
  • short circuiting ( live wire and neutral wire joined together )
  • fluctuation in voltage

Electrical energy consumed is measured by meter in a unit called B.O.T ( Board of trade ) unit or Kilowatt hour (KWh). 1 unit = 1 KWh

1 KWh = 3600000 joule = 3.6 × 106

Exercises
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Exercises
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  • Electrical Power and Household Circuits - SmartTest

    A SmartTest on Electrical Power and Household Circuits

    • Accessed by: 166 Students
    • Average Time: 00:04:06
    • Average Score: 55.21
    • Questions: 39
    • Introduction to electric energy
    • Measurement of electric energy
    • Electrical power
    • Commercial unit of energy
    • Household consumption of electrical energy
    • Heating effect of current
    • Household wiring system
    • Electric fuse
    • Electric switch
    • Earthing the appliances
    • Electrical Power and Household Circuits review

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