When an electric lamp is connected to 12 V battery,it draws a current of 0.5 A.The power of the lamp is
0.5 W
12 W
6 W
24W
SI unit of specific resistance is
ohm m
(ohm)-1
(ohm m)2
ohm m-1
A flow of 107 electrons per second in a conducting wire constitutes a current of :
1.6 x 10-26 A
1.6 x 1012 A
1.6 x 10-12 A
1.6 x 1026 A
A wire whose resistance is 90 Ω is cut into 3 pieces of equal lengths which are then arranged in parallel.Calculate the resistance of the combination.
10 Ω
1/10 Ω
30Ω
1/30Ω
Pick the odd one out
ammeter
voltmeter
rheostat
odometer
The device used for measuring potential difference is known as
galvanometer
voltameter
potentiometer
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Calculate the amount of electric charge that flows through the circuit.
200 C
300 C
400 C
100 C
The heat produced by passing an electric current through a fixed resistor is proportional to the square of :
magnitude of resistance of the resistor
temperature of the resistor
magnitude of current
time for which current is passed
Assertion (A) : The temperature of a metal wire rises when an electric current is passed through it.
Reason (R) : Collision of metal atoms with each other releases heat energy.
Both A and R are true and R is the correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
The reciprocal of a resistance of a conductor is
conductance
capacitance
conductivity
impedance
