Question

define, in any form, what is meant by a kW-hr of energy.  Write up your analysis in a professional technical memorandum

Answer 1

kW-hr of energy defination:---

The kilowatt-hour is a unit of energy equivalent to one kilowatt of power expended for one hour of time. The kilowatt-hour is not a standard unit in any formal system, but it is commonly used in electrical applications.

In general, energy   is equivalent to power multiplied by time . To determine E in kilowatt-hours, P must be expressed in kilowatts and t must be expressed in hours.

for example:---

a 1.5-kW electric heater runs for 3 h. Then P = 1.5 and t = 3, so the energy E in kilowatt-hours is:

E = Pt = 1.5 x 3 = 4.5 kWh

HISTORY OF KWH:----

The kilowatt-hour is rarely used to express energy in any form other than electrical. A quantity of gasoline, oil, or coal contains potential energy that is liberated when the fuel is burned. The heat energy resulting from combustion of such fuels is usually expressed in joules according to the International System of Units (SI) or in British thermal units (Btus) according to the foot-pound-second (fps) or English system. If this energy is used to operate an electric generator, the output of the generator over a certain period of time can be expressed in kilowatt-hours.