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
30 Ω
1/30 Ω
By what name is unit Joule/ coulomb known as :
Volt
Coulomb
Weber
Farad
SI unit of specific resistance is
ohm m
(ohm)-1
(ohm m)2
ohm m-1
An electric lamp whose resistance is 30Ω and a conductor of 4Ω resistance,one end is connected with each other and another end is connected to a 6V battery. Calculate the total resistance of the circuit.?
34
3.4
0.3
1200
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
An electric fuse works on the :
chemical effect of current
magnetic effect of current
lighting effect of current
heating effect of current
The work done in moving a unit charge across two points in an electric circuit is a measure of :
Current
Potential difference
Resistance
Power
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
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
