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 insulation layer
C. Resistance of heater coil is more than the supply wires
D. Supply wires are made of superior material
Answer: Option C
This Question Belongs to Electrical Engineering >> Current Electricity
Resistance of a material always decreases if
A. Temperature of material is decreased
B. Temperature of material is increased
C. Number of free electrons available becomes more
D. None of the above is correct
The minimum charge on an ion is
A. Equal to the atomic number of the atom
B. Equal to the charge of an electron
C. Equal to the charge of the number of electrons in an atom
D. Zero
Current velocity through a copper conductor is
A. the same as propagation velocity of electric energy
B. independent of current strength
C. of the order of a few micro m/s
D. nearly 3 x 108 m/s
Join The Discussion