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ELECTROMOTIVE FORCE – EMF:
To make use of electricity by provision of an electric current, the potential different must be maintained. That is, the positive and negative charge must be continuously replenished. A cell (or battery) uses chemical energy to maintain the potential difference.
Another device used for this purpose is the generator, which uses electro-mechanical energy to maintain the potential difference. The potential difference across the terminals of the source (cell, battery or generator) when it is not supplying current, is called Electromotive Force (emf), since this is a measure of the force available to push electrons around the circuit. In a circuit with a current flowing, the potential difference across the terminals of the source is always less than the emf and is referred to as the terminal voltage.
A 400kVA transformer has a primary winding resistance of 0.5Ω and a secondary winding resistance of 0.001Ω . The iron loss is 2.5kW and the primary and secondary voltages are
Vibratory and Oscillatory Motion : To and fro or back and forth motion of an object is known as vibratory and oscillatory motion.
A capacitor and a coil are linked in series. The capacitor is charged and allowed to discharge by the coil. The current that will then flow by the capacitor-coil combination
A simple electric circuit, where current is represented by the letter i. The relationship among the voltage (V), resistance (R), and current (I) is V=IR; this is called as Ohm''s L
Nuclear Decays Uses a proper Monte Carlo engine to simulate real decays.The decay of 500 atoms of the fictional element Balonium.
A monochromatic light of wavelength 6000Å is incident on a plane diffraction grating with grating element 6 X 10 -5 cm. Evaluate the maximum order of spectrum that will be observe
FORCE AND NEWTON'S LAWS 1. Ancient view objects tend to stop if they are in motion; force is needed to keep something motion. This was a natural thing to believe in beca
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A boy throws a ball of mass 20 kg vertically upwards.It raises to a maximum height of 100 m.At what height will the kinetic energy be reduced to 70%?
In Rutherford's experiment including the deflection of alpha particles by atomic nuclei, the fact that some of the alpha particles bombarding the thin gold foil were back-scattered
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