An agent which cause the property of attraction in the substances & the substances possessing this property are called as electrified or charged with electricity.

Or A natural force which cannot be seen, heard or handle like other object. Types of electricity are.

(a) Electrostatic electricity.

(b) Electrodynamics electricity:

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The quantity of electricity which passes through a conductor in a given time.

Energy Flows –

Primary Energy:

Processes that create new energy.

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Derived energy:

Processes that change primary energy into another form of energy.

Secondary energy Sources:

A secondary energy is one where the energy has undergone conversion from one form to another. The most common secondary energy source is electricity where thermal energy, from fossil fuels, and kinetic energy, in moving water, are converted into electrical energy.

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The process of converting fossil fuels into elec­tricity has a low efficiency, but the use of combined heat and power (CHP) can increase this to 80-90 per cent.

The functioning of most of the electrical appliances depend on, the electricity. If the electrical energy service is interrupted for a short period, large percentage of the services offered by hotels eg. food service units, clubs, health care units etc. will cease and cannot be activated to the normal level until the flow of electrical energy is resumed to an adequate quantity.

The hotel industry is dependent on electricity for heat, light and power. Hence the dependence on such type of the source of energy cannot be under estimated and value in the hotel life is almost impossible to accurately determine.

Because electrical energy not only provide heat, light and power but it also provides means of communication, control system etc. Thus electricity is used in hotel industry in the following cases –

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(i) For operating lifts, elevators & escalators (ii) Space lighting (iii) Ventilation (iv) Refrigeration (v) Air conditioning (vi) Stereo system (vii) TV (viii) Heating (ix) Water pumping (x) Food preparation and many other functions.