Current Electricity
In the case of direct current

Magnitude and direction of current changes with time
Magnitude of current remains constant
Magnitude and direction of current remains constant
Magnitude of current changes with time

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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 wiring is covered with insulation layer
Current through supply line flows at slower speed
Supply wires are made of superior material

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