Questions in Current Electricity

Select	Question
	There are two electric bulbs of 40 W and 100 W. Which one will be brighter when first connected in series and then in parallel,
	Two resistances ${R_1}$ and ${R_2}$ when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by ${R_1}$ to that consumed by ${R_2}$ will be
	A 220volt and 800 watt electric kettle and three 220 volt and 100 watt bulbs are connected in parallel. On connecting this combination with 220 volt electric supply, the total current will be
	You are given three bulbs of 25, 40 and 60 watt. Which of them has lowest resistance
	The value of internal resistance of an ideal cell is
	Electric power is transmitted over long distances through conducting wires at high voltage because
	A coil develops heat of 800 cal/sec. When 20 volts is applied across its ends. The resistance of the coil is (1 cal= 4.2 joule)
	Resistances ${R_1}$ and ${R_2}$ are joined in parallel and a current is passed so that the amount of heat liberated is ${H_1}$ and ${H_2}$ respectively. The ratio $\frac{{{H_1}}}{{{H_2}}}$ has the value
	The internal resistance of a primary cell is 4 ohm. It generates a current of 0.2 amp in an external resistance of 21 ohm. The rate at which chemical energy is consumed in providing the current is
	A heating coil is labelled 100 W, 220 V. The coil is cut in half and the two pieces are joined in parallel to the same source. The energy now liberated per second is