Current Electricity
International ohm is defined in terms of the resistance of

A cube of carbon
A column of mercury
A cube of copper
The unit length of wire

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Current Electricity
When current flows through heater coil it glows but supply wiring does not glow because

Supply wiring is covered with insulation layer
Resistance of heater coil is more than the supply wires
Current through supply line flows at slower speed
Supply wires are made of superior material

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