Answer the following questions related to alternating current :
(a) What is an alternating current (AC)
(b) What is the value of frequency of AC In India?
c) What is the periodic time of AC In India?
(d) State one advantage of AC over DC
(e) State any two uses of an AC generator
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Answers
a).
Alternating current (AC) is an electric current which periodically reverses direction, in contrast to direct current (DC) which flows only in one direction. ... The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.
b)
The frequency of Alternating Current in India is 50 Hz. This simply means that the magnetic field around the armature in the AC Generators in India rotates 50 times per second.
c)
The periodic time of an AC current in India is 1 by 50Hz per sec. the frequency of Alternating Current in India is 50 Hz. This simply means that the magnetic field around the armature in the AC Generators in India rotates 50 times per second.
d)
The first advantage AC power has over DC is in power transmission. ... Both AC and DC have power loss in long lines because of the resistance in the wires. For a fixed power, higher voltage results in lower current through the power line, and lower current means lower power line losses.
e)
In electricity generation, a generator is a device that converts motive power (mechanical energy) into electrical power for use in an external circuit. Sources of mechanical energy include steam turbines, gas turbines, water turbines, internal combustion engines and even hand cranks.