A 50 W bulb is connected in a 200V line. Determine the current flowing in it and its resistance. If 10% of the total power is converted into light, then what will be the rate of production of heat? Take `J=4.2J "cal"^(-1)`.

A resistor and a capacitor are connected to an ac supply of 200 V, 50 Hz, in series. The current in the circuit is 2A. If the power consumed in the circuit is 100 W then the resistance in the circuit is

A torch bulb is rated 5V and 500 mA. Calculate (i) its power, (ii) its resistance and the energy consumed if this bulb is lighted for 4 hours.

If 240 J heat is generated in a conductor of resistance 50 Omega when 0.2 A current is passed through it, then for how long is the current flowing through the conductor?

Three 60 W , 120 V light bulbs are connected across a 120 V power lines as shown in Fig. 7.26 . Find (a) the voltage across each bulb and (b) the total power dissipated in the three bulbs.

A battery of emf 10 V is connected with a load resistance of 50 Omega the total power delivered by the battery is 2 W. If load resistance is replaced by R then power delivered is 4 W, the value of R is

There 60 W , 120 V light bulbs are connected across a 120 V powe source. If resistance of each bulb does not change with current then find out total powe deliver to the three bulbs.

A resistance of 1 Omega is connected to a battery of emf 2 V and internal resistance 0.4 Omega what current is flowing through the circuit ? If another battery of double the emf is connected in series with the earlier one then current flowing in the circuit becomes double . what should be the internal resistance of battery ?