Current Electricity
The thickness of insulation provided on the conductor depends on

The magnitude of voltage on the conductor
The magnitude of current flowing through it
None of the listed here
Both magnitude of voltage and current

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

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

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