Whether circuit may be AC. or D. C. one, following is most effective in reducing the magnitude of the current?
A. Reactor
B. Capacitor
C. Inductor
D. Resistor
A. 2 watts
B. 4 watts
C. 6 watts
D. 12 watts
Out of the following which is an insulating material____________?
A. Copper
B. Gold
C. Silver
D. Paper
How many coulombs of charge flow through a circuit carrying a current of 10 A in 1 minute?
A. 10
B. 60
C. 600
D. 1200
1 Ampere current means flowing of 1 Coulomb charge per second. That means 10 A current in 1 minute or 60 seconds implies 10 × 60 = 600 coulombs.
A field of force can exist only between_____________?
A. two molecules
B. two ions
C. two atoms
D. two metal particles
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchanged
Which quantity consists of a unit 1KWh ?
A. Energy
B. Time
C. Power
D. Charge
1 kWh is the amount of energy used by a 1 kW (1000 watt) resistance for 1 hour. Energy = Power × Time.