An electric motor takes 5 A from a 220 V line. Determine the power of the motor and the energy consumed in 2 h.

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain, twice as much water from the same pipe, in the same time, the power of motor has to be increased to n times. Find n.

An elevator can carry a maximum load of 1800 kg (elevator + pasenger) is moving up with a constant speed of 2ms^(-1) . The frictional force opposing the motion is 4000 N. Determine the minimum power delivered by the motor to the elevator in watts as well as in horse power..

An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be –

A motor vehicle travelled the first third of a distance s at a speed of v_1 =10 kmph, the second third at a speed of v_2 =20 kmph and the last third at a speed of v_3 =60 kmph. Determine the mean speed of the vehicle over the entire distance s.