When a current I flows through a resistance R for time t, the electrical energy spent is given by
IRt
I2Rt
IR2t
I2R/t
SI unit of power is
Watt
Kilowatt
Mega watt
Horse power
Fuse is always connected in
live wire
neutral
earth
none of these
Out of 3 fuses with current ratings 5 A, 10 A, 15 A which one is to be connected in a geyser circuit marked 3 kW, 220 V.
15 A
5 A
10 A
Both a and b
SI unit of electrical energy
Calorie
Joule
Kilowatt hour
Two bulbs are marked 60 W, 220 V and 60 W, 110 V respectivelly. The ratio of resistance is:
4:1
2:1
2:4
4:3
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
1 Wh =
3600 J
3.6 x 106 J
360 J
3.6 J
Which of the following wires have same potential?
Neutral and Live
Neutral and Earth
Live and Earth
The bulb is rated as 100W - 250V, the resistance of its filament while glowing is,
100 Ω
250 Ω
625 Ω
2500 Ω
