What is the potential difference, in volts, required to pass a current of 3 A through a resistor of 6 ohms?
3 Volts
120 Volts
18 Volts
180 Volts
If a resistor is added in parallel with one of equal resistance, the resistance of the combination
increases by a small fraction
is doubled
decreases by a small fraction
is halved
What is the maximum power that an appliance should have if it is connect to a 230V supply by a 5A cable .
46W
1.15 KW
115W
4.6 KW
Two light bulbs P and Q are identical in all respects, except that P's filament is thicker than Q's. If the same potential difference is applied to each, then
P will burn brighter because it has the greater resistance.
Q will burn brighter because it has the greater resistance.
P will burn brighter because it has the lower resistance
Q will burn brighter because it has the lower resistance
The potential at a point is 20 V. What is the work done to bring a charge of 0.5 C from infinity to this point.
20J
10J
5J
40J
In an electric motor, the energy transformation is from
electrical to chemical
electrical to mechanical
mechanical to electrical
chemical to electrical
Find the time required to deposit electrolytically 2 gm of gold by passing a current of 2 A. The e.c.e.of gold is 0.0006812 gm/coulomb.
14.68 min
13.64 sec
7.8 min
Two light bulbs are marked 230 V; 75 W and 230 V; 150 W. If the first bulb has a resistance R, then what is the resistance of the second bulb?
¼ R
½ R
2 R
4R
Which of the following statements does not represent ohm's law?
current / potential difference = constant
potential difference / current = constant
pottential difference = Resistance × current
current = resistance x potential difference
What is the charge, in Coulombs, which passes a point in a circuit in 1 minute when a current of 3 A is flowing?
12 Coulombs
120 Coulombs
18 Coulombs
180 Coulombs
