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

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

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Current Electricity
In a series circuit with unequal resistances

The highest resistance has the most of the current through it
The highest resistance has the highest voltage drop
The lowest resistance has the highest voltage drop
The lowest resistance has the highest current

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