Current Electri...

Two electric bulbs A and B are rated as 60 W and 100 W. They are connected in parallel to the same source. Then,

A 5.0 A current is set up in an external circuit by a 6.0 V storage battery for 6.0 min. The chemical energy of the battery is reduced by

The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp, when not in use ?

Two bulbs X and Y having same voltage rating and of power 40 W and 60 W respectively are connected in series across a potential difference of 300 V, then

Two bulbs (25 W – 220 V) and (100 W – 220 V) are given. Which has higher resistance?

A coil takes 15 min to boil a certain amount of water, another coil takes 20 mm for the same process, Time taken to boil the same amount of water when both coils are connected in series

If a current is allowed to pass through a circuit consisting of two dissimilar metals, there is either evolution or absorption of heat at the junction, depending upon the direction of the current. The effect is known as

The thermo emf of a thermocouple is 25µV/°C at room temperature. A galvanometer of 40 Ω resistance capable of detecting current as low as 10^-5 A, is connected with the thermocouple. The smallest temperature difference that can be detected by this system is

If the cold junction of a thermocouple is kept at 0°C and the hot junction is kept at T°C, then the relation between neutral temperature (T_n) and temperature of inversion (T_i) is