A torch bulb rated 4.5 W, 1.5 V is connected as shown in Fig. 7.35. The emf of the cell needed to make the bulb glow at full intensity is

A room heater is rated 500 W, 220V . (a) Find the resistance of its coil. (b) If the supply voltage drops to 200 V , what will be the power consumed? ( c) If an electric bulb rated 100 W, 220 V is connected in series with this heater, what will be the power consumed by the heater and by the bulb when the supply is at 220 V ?

An electric bulb rated '220 V, 60 W' glows when connected with 220 V mains. Find the resistance of the filament of the bulb.

A 100W bulb is connected to an AC source of 220V , 50Hz . Then the current flowing through the bulb is

An electric bulb marked 25 W and 100 V is connected across 50 V supply . Now its power is .

Three 60 W, 120 V light bulbs are connected across a 120 V source as shown in figure. The total power dissipation in the three bulbs are

An electric bulb draws 1.2 A current at 6V. Find the resistance of the filament of the bulb while glowing

An electric bulb rated '220 V, 60 W' glows when connected with 220 V mains. Another identical bulb is connected in series with the first one and the system is connected across the 220 V mains. Draw a diagram to show the arrangement and find : (a) the rate of consumption of energy in each bulb, and (ii) total power consumed.

If a bulb rated as (25W-220V) is connected in series to another bulb rated as (100W-220v) to 220 volt, then which bulb will give more illumination.

If two bulbs, both of rated power 100 W at 220 V, are connected in series with a 220 V supply, the total power consumed by the bulbs will be: