ratio of output power to input power

Tidal Power - The tides are formed due to the gravitational force of attraction between the earth, sun and moon. During high tides sea water is trapped in a reservoir, and released later to drive turbines, which in turn produces electricity. The block diagram given below illustrates the t..

The frequency of wave used in pumping process corresponds to the energy gap between L and H states(5600A o ). The stimulated wave corresponds to the energy gap between M and L states (6943A o ). The wavelength of output beam, 6943A o (equal to about 4.32x10 14 cycle s -1 in frequency) lie..

The electricity produced from flowing water is called Hydroelectric power. The world's first hydroelectric power plant was set up in 1882 in Wisconsin USA. It had a very small output, supplying power only for about 250 light bulbs. But from this small s..

The electricity produced from flowing water is called Hydroelectric power. The world's first hydroelectric power plant was set up in 1882 in Wisconsin USA. It had a very small output, supplying power only for about 250 light bulbs. But from this small start t..

The magnifying power of a compound microscope is defined as the ratio of the size of the final image (I 2 ) as seen through the microscope to the size of the object as seen with a naked eye. Image Formation in a Compound Microscope = m o b j e c t i v e x m e y e p i e c e = m o..

where W 1 is the input power and W 2 the output power. If W W 2 exceeds W 1 , the value is positive and is spoken of as again. When W 1 exceeds W 2 the expression will be negative and indicates a loss. The decibel is also used as a measure of the amount of ..

A good source of energy should have the following characteristics: It should do a large amount of work per unit mass or volume - it means that the output energy must be more than the input energy. It should have high calorific value. It should be easily accessible - the en..

. It is measured in candela or candle power (C.P.) Illuminance or Intensity of illumination (E) of a surface is the luminous flux incident normally on unit area of the surface. E is measured in lux or meter candle and photo or cm candle, 1 photo = 10 4 lux. Luminance of a surface refers t..

Characteristics of Sources of Energy - A good source of energy should have the following characteristics: It should do a large amount of work per unit mass or volume - it means that the output energy must be more than the input energy. It should have high calorific value. It sho..