The unit for expressing electric power is :
volt
joule
coulomb
watt
The elements of electrical heating devices are usually made of :
Tungsten
Bronze
Nichrome
Argon
Name the commercial unit of electric energy.
kilowatt hour
erg
Which of the following characteristic is not suitable for a fuse wire?
thin and short
thick and short
low melting point
higher resistance than rest of wiring
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
The current of 10 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit ?
100 C
6000 C
600 C
10 C
Current through a 12 V tungsten filament lamp connected to a 12 V accumulator of negligible resistance of 3 A. Calculate resistance of filament?
4 Ω
6 Ω
12 Ω
24 Ω
The potential difference between the terminals of an electric iron is 240 V and the current is 5.0 A. What is the resistance of the electric iron?
48 Ω
4.8 Ω
0.48 Ω
480 Ω
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
Which unit is used to measure the electric current?
Ampere
Volt
Coulomb
Watt
