An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
100 W
75 W
50 W
25 W
A geyser has a rating of 2 kW, 240 V. What is the cost of using it for 30 minutes, if the cost of electricity is Rs.3 per commercial unit?
Rs.3
Rs.6
Rs.9
Rs.15
A switch must be connected in
live wire
neutral wire
earth wire
either live or neutral wire
The electrical appliances in the houses are connected with each other in
parallel
series
a combination of series and parallel circuits
either series or parallel
According to International convention of colour coding of insulation of wires in a cable :
live is red, neutral is blue and earth is brown
live is red, neutral is green and earth is black
live is brown, neutral is blue and earth is black
live is brown, neutral is light blue and earth is green
At what voltage is the electric power generated at the power generating station?
11 kV
21 kV
25 kV
40 kV
1 kWh =
3.6 x 106J
3.6 x 103J
3.6 x 109J
3.6 x 10-3J
A 2 kW boiler used for 1 hour everyday consumes electrical energy in thirty days equal to
120 units
60 units
15 units
40 units
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
0.727 A
0.625 A
0.825 A
1.35 A
The frequency of AC used in India is
50 Hz
100 Hz
200 Hz
1/100 Hz
