The cost at 5 paise/KWH of operating an electric motor for 8 hours which takes 15 amp at `110V` is

The cost of 2Rs/kWh of operating an electric motor for 10hours takes 10amp at 110V is:

The power rating of an electric motor that draws a current of 3.75 A , when operated at 200 V , is nearly

An installation consists of an electric motor which drives a water pump to lift 75 L of water per second to a height of 5m, where water is disbursed at neglible speed. If the motor consumes a power of 5 kW, then what is the efficiency (%) of the installation? [g = 10 ms^(-2)]

The stopping potential in an experiment on a photo electric effect is 1.5 V. What is the maximum kinetic energy of the photoelectrons emitted?

State Joule's law of heating and give its mathematical form. An electric iron takes a current of 5A and develops 1.5 xx 10^(4) J of heat energy in 30 s. Calculate the resistance of the electric iron.

Aimee takes 6 minutes to pack a box and Brianna takes 5 minutes to pack a box. How many hours will it take them to pack 110 boxes?

(a) Define 1 watt. (b) State the commercial unit of electric energy. Express it in terms of SI unit of energy. (c) An electric refrigerator rated as 750 W operates 8 hours per day. What is the cost of the energy to operate it for the month of June at Rs. 2.50 per kWh ?

A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A . The battery on discharge supplies a current of 5 A for 15 hours. The terminal voltage during discharge is 14 V . The 'Watt-hour" efficiency of the battery is.

Write commercial and SI units of energy. Calculate the cost of electric energy consumed by an electric heater rated with 50 W used for 2 hours daily in the month of April. The cost of one unit of electric energy is Rs. 5.

Find the ratio of the following: (a) 30 minutes to 1.5 hours (b) 40 cm to 1.5 m (c) 55 paise to Re 1 (d) 500 ml to 2 litres