The instant at which a bulb is switched on, its power is maximum , then it decreases to a steady value . Explain.

The two electric bulbs of same power are connected in parallel circuit. If one bulb is glowing and then another bulb is switched on, then brightness of the first bulb increases, decreases or remians unchanged. Expalin.

The supply voltage to room is 120 V. The resistance of the lead wires is 6Omega . A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb?

A cylindrical rod of heat capacity 120 J//K in a room temperature 27^(@)C is heated internally by heater of power 250W , The steady state temperature attained by the rod is 37^(@)C . Fin the following: (a) The initial rate of increse in temperature (b) The steady state rate of emission of radiant heat. If the heater is switched off, find (c) The initial rate of decrease is temperature (d) The rate of decrease in temperature of the cylinder when its temperature falls to 31^(@)C and (e) The maximum amount of heat lost by the cylinder

If a constant potential difference is applied across a bulb, the current slightly decreases as time passes and then becomes constant. Explain.

If the current in an electric bulb decreases by 0.5 % , the power in the bulb decreases by approximately