Find the ratio of resistances for two bulbs of 220 V-60W and 110V-60W.

Two bulbs are marked 220V - 100 W and 110 V- 100W. The ratio of the resistances of the two bulbs is

what is the resistances each of an electric bulb marked 220 V -100 W in incandescent state ?

What is the resistance of the filament of a 220V-60 W bulb ? If the bulb is used in a 110 V line instead of 220 V line, then what amount of power it will consume ?

On the glass surface of an electric bulb it.is marked 220V - 100 W. What does it indicate.

Show that the equivalent resistance in parallel combination is less than each of the resistances. The main Voltage for a house is 220V, the fuse is of 5A, What Will be the maximum number of 60Watt bulb that can be switched or together?

The internal resistance of two cells are I Omega and 2 Omega . Their e.m.fs are 1.5 V and 2 V respectively. The parallel combination of these two cells are connected to an external resistance 5 Omega . draw the circuit and find current thorough external resistance.

A parallel combination of three resistances of 6 Omega, 12 Omega and 12 Omega is connected in series with an electric cell of emf 1.5 V and internal resistance 2 Omega . Find out the currents through the three resistances.

What precaution has to be take to run a 220 V - 600 W heater safely in a 440 V line ?