Current Electri...

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 5 W. The rate of heat dissipation in A is

An electric bulb is designed to draw power P₀ at voltage V₀. If the voltage is V it draws a power P. Then

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 having resistance of 2 Ω and 4 Ω are connected to same voltage. Ratio of heat dissipated at resistance is

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 is

If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be

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 3 A 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

How many calories of heat will be produced approximately in a 210 watt electric bulb in 5 minutes