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

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

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

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

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