Questions in Current Electricity

Select	Question
	Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
	If two electric bulbs have 40W and 60W rating at $220V$, then the ratio of their resistances will be
	An electric bulb is designed to draw power P0 at voltage V0. If the voltage is V it draws a power P. Then
	Three bulbs of 40W, 60W and 100W are arranged in series with 220V. Which bulb has minimum resistance
	An electric kettle has two heating coils. When one coil is used, water in the kettle boils in 5 minutes, while when second coil is used, same water boils in 10 minutes. If the two coils, connected in parallel are used simultaneously, the same water will boil in time
	An external resistance R is connected to a battery of e.m.f.V and internal resistance r. The joule heat produced in resistor R is maximum when R is equal to
	The amount of heat produced in a resistor when a current is passed through it can be found using
	Two wires have resistance of 2? and 4? connected to same voltage, ratio of heat dissipated at resistance is
	Two electric bulbs rated ${P_1}$ watt V volts and ${P_2}$ watt V volts are connected in parallel and V volts are applied to it. The total power will be
	n identical bulbs, each designed to draw a power p from a certain voltage supply, are joined in series across that supply. The total power which they will draw i