Questions in Current Electricity

Select	Question
	A wire when connected to 220V mains supply has power dissipation ${P_1}$. Now the wire is cut into two equal pieces which are connected in parallel to the same supply. Power dissipation in this case is ${P_2}$. Then ${P_2}:{P_1}$ is
	An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is
	Electric bulb 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, $10 \Omega$. Maximum number of bulbs that can be connected so that they glow in full power is
	A bulb has specification of one kilowatt and 250 volts, the resistance of bulb is
	If a 30 V, 90 W bulb is to be worked on a 120 V line, a resistance of how many ohms should be connected in series with the bulb
	A fuse wire with radius 1 mm blows at 1.5 amp. The radius of the fuse wire of the same material to blow at 3A will be
	Three electric bulbs of rating 60W each are joined in series and then connected to electric mains. The power consumed by these three bulbs will be
	An electric bulb is rated 60W, 220V. The resistance of its filament is
	A 220 volt, 1000 W bulb is connected across a 110 volt mains supply. The power consumed will be
	Two bulbs of 100 W and 200 W working at 220 volt are joined in series with 220 volt supply. Total power consumed will be approximately.