Twenty one electric bulbs are connected in series with the mains of a 220V supply. After one bulb is fused, the remaining 20bulbs are again connected in series across the same mains. By what percentage will the illuminaton of (i) a bulb change and (ii) all the bulbs change?

40 electric bulb are connected in series across a 220 V supply. After one bulb is fused the remaining 39 are connected again in series across the same supply. The illumination will be

Some electric bulbs are connected in series across a 220 V supply in a room. If one bulb is fused then remaining bulbs are connected again in series across the same supply. The illumination in the room will

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

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

There is a frill of 20 bulbe (connected in series ) in a room. One bulb is fused. The remaining 19 bulbs are again joined in series and connected to the same supply. Will the light increase or decrease in the room ?

n identical bulbs are connected in series and illuminated by a power supply . One of the bulbs gets fused. The fused bulb is removed , and the remaining bulbs are again illuminated by the same power supply. Find the fractional change in the illuminated of (a) all the bulbs and (b) one bulb.

Two electric bulbs marked 25W-220V and 100W-220V are connected in series to a 440 V supply. Which of the bulbs will fuse ?

An iron choke and an electric bulb are connected in series with AC mains. On introducing a soft iron bar in the coil, the intensity of bulb will