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
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 :
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
A SmartTest on Electrical Power and Household Circuits