We have a `30 W, 6 V` bulb , which we want to glow by a supply of `120 V` . What can be done for this ?

A light bulb is rated at 100 W for a 220 V ac supply . The resistance of the bulb is

Ten 60 W, 220 V bulbs are connected in series to 220 V supply . Power consumed in the circuit is

A 100 W, 200 V bulb is connected to a 160 V supply. The power consumption would be

A bulb is connected to a 100 V DC supply . It is found that the current of 5 A flows in the circuit. The same bulb is connected to an AC supply at 120 V . The frequency of source is 50 Hz. Calculate the inductance of coil required so that the lamp glows in an AC circuit too.

An electric bulb, marked 40 W and 200 V , is used in a circuit of supply voltage 100 V . Now its power is

An electric bulb, when connected across a power supply of 220V , consumes a power of 60 W . If the supply drops supply is suddently increased to 240 V , what will be the power consumed?

A 100 W 200 V bulb is connected to a 160 V power supply. The power consumption would be

An electric bulb with rating 200 W, 50V is connected to a source of 120 V. A resistance R is connected in series to the bulb, so that the bulb delivers 200W . Calculate the value of R.

A torch bulb when cold has 1 Omega resistance. It draws a current of 0.3 A when glowing from a source of 3 V . Calculate the resistance of the bulb when glowing and explain the reason for the difference in resistance.

A light bulb is rated 150 W for 220 V ac supply of 60 Hz. Calculate (i) the resistance of the bulb, (ii) the rms current through the bulb.