Question

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

• A. current through supply line flows at slower speed
• B. supply wiring is covered with insulated layer
• C. resistance of heater coil is more than supply wires
• D. supply wires are made of superior material

Answer 1

The correct option is C resistance of heater coil is more than supply wires

Supply wire has low resistance than the heater coil, thus according to Joules heating effect heat produced in the supply wire is very less and hence it does not glow when current flows through it.