Current Electricity
The insulation on a current carrying conductor is provided

Both of the listed here
To prevent leakage of current
None of above factors
To prevent shock

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

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