The family pays Rs 1000 for electricity on an average in those months in which it does not use a water heater. In the months in whih it uses a water heater, the average electricity bill is Rs 1240. The cost of using the water heater is Rs 8.00 per hour. Find the average number of hours the water heater is used in a day.

A solar water heater cannot be used to get hot water on

An electric heater rated 800 W operates 6h/day. Find the cost of energy to operate it for 30 days at ₹ 3.00 per unit.

Solar water heaters use cadmium black as a coating material on copper water pipes. Explain why

Define electric power. An electric motor is rated at 2kW. Calculate the cost of using it for 2 hours daily for the month of September if each unit costs ₹ 6.00.

Suppose a company needs a computer for some period of time. The company can either hire a computer for Rs. 2,000 per month or buy one for Rs 25,000. If the company has to use the computer for a long period, the company will pay such a high rent, that buying a computer has to use the computer will be cheaper. Find the number of months beyond which it will be cheaper to buy a computer.