Question

write a notes on direct and alternating current

Answer 1

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1) DC:-

As the name implies direct current, DC is a form of electricity that flows in one direction – it is direct and this gives it its name.

Direct current in a basic circuit.

The characteristic of direct current, DC can be shown on a graph. Here the current can be seen to be seen to be either positive or negative only.Graph showing direct current attributes

>>Applications of Direct Current DC:-

• Batteries: Batteries, both non-rechargeable and re-chargeable can only supply direct current. The rechargeable batteries also need recharging using direct current.

• Electronic equipment: All equipment like computers, radios, mobile phones, and in fact all electronic equipment uses direct current to power the electronic circuits. Bipolar transistors, FETs and the integrated circuits that use these components all need direct current to power them and will damaged if a reverse polarity is supplied.

• Some electrical equipment: Although a lot of electrical equipment uses AC, some uses direct current.

2) AC:-

Alternating current, AC is different to direct current. As the name implies, it flows first in one direction and then the other.

The current waveform varying as a sine wave, with the current first moving in one direction and then the other.

Often it is more usual to see the voltage variations. Again for an alternating waveform the voltage will vary positive and negative.

It can be seen for both current and voltage.

>>Applications of Alternating Current AC:-

Alternating current tends to be used for power distribution. It has the advantage that it can easily be converted to other voltages using a simple transformer - transformers do not work with direct current.

If power is distributed at a high voltage then the losses are much lower.

High voltages are used for power transmission, and then reduced to a relatively safe level for use within domestic and commercial properties.

Voltages are used for power transmission, and then reduced to a relatively safe level for use within domestic and commercial properties.In view of the fact that alternating current is used for the supply system, it is also used in motors, for heating and for many other items without the need for it to be converted to direct current.

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