Current Electri...

In the circuit as shown in the figure, the heat produced by 6 ohm resistance due to current flowing in it is 60 calorie per second. The heat generated across 3 ohm resistance per second will be

A 500 W heating unit is designed to operate from a 115 volt line. If the line voltage drops to 110 volt, the percentage drop in heat output will be

A heater of 220 V heats a volume of water in 5 minute time. A heater of 110 V heats the same volume of water in

An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from room temperature 20° C? The temperature of boiling water is 100° C

If a wire of resistance 20 Ω is covered with ice and a voltage of 210 V is applied across the wire, then the rate of melting of ice is

Four identical electrical lamps are labelled 1.5 V, 0.5 A which describes the condition necessary for them to operate at normal brightness. A 12 V battery of negligible internal resistance is connected to lamps as shown, then

A 100 W bulb B₁, and two 60-W bulbs B₂ and B₃, are connected to a 250 V source, as shown in the figure. Now W₁, W₂ and W₃ are the output powers of the bulbs B₁, B₂ and B₃, respectively. Then

The three resistances of equal values are arranged in different combinations shown below. Arrange them in increasing order of power dissipation

Silver and copper voltameters are connected in parallel with a battery of e.m.f. 12 V. In 30 minutes, lg of silver and 1.8g of copper are liberated. The power supplied by the battery is
(Z_Cu = 6.6 × 10^–4 g/C and Z_Ag = 11.2 × 10^–4 g/C)

A silver voltameter of resistance 2 ohm and a 3 ohm resistor are connected in series across a cell. If a resistance of 2 ohm is connected in parallel with the voltameter, then the rate of deposition of silver