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## Simple UPS

This is the circuit diagram of a simple UPS that can deliver 12V unregulated and 5V regulated DC. The transformer T1 steps down the mains voltage to 12V AC and then the bridge B1 rectifies it. The rectified signal is smoothed by the capacitor C1

## Transistor codes

There are three main series of transistor codes used in the UK:The first letter B is for silicon, A is for germanium (rarely used now). The second letter indicates the type; for example C means low power audio frequency; D means high power audio frequency; F means low power high frequency. Read more about Transistor codes

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## TRANSFORMER

A transformer is an electrical device used to change the  value of an alternating voltage. transformers are widely used in electrical  work. Read more about TRANSFORMER

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## Resistor

Opposition to the flow of current is called resistance and the device or component used for this purpose is called resistor. Read more about Resistor

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## SUPERPOSITION THEOREM

Any linear bilateral circuit, which contain, G/R of same frequency the current that flows in any branch is the sum of the current's that would result from each G/R Working independently while other G/R.
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## OHM LAW

Ohm's law states that in an electric circuit the current is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit.
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## Faraday's law's of Electromagnetic induction

First Law of Faraday's Electromagnetic Induction state that whenever a conductor are placed in a varying magnetic field emf are induced which is called induced emf, if the conductor circuit are closed current are also induced which is called induced current. Read more about Faraday's law's of Electromagnetic induction

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## Inverter Project 12v DC to 120V AC

Inverter is a device that converts 12 volts dc to 120 volts ac, which is what we use in our homes.  This project will handle about 300 watts, which is perfect for lights, small T.V.'s and radio equipment. Read more about Inverter Project 12v DC to 120V AC

## TRANSFORMER CHARACTERISTICS

In Figure we can now look at the circuit from the example, redrawn with the calculated voltage and current values included. Read more about TRANSFORMER CHARACTERISTICS

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## UPS - Uninterrupted Power Supply

Some time disturbance of power supply creates a number of problems.  Especially in sensitive departments such as Radar System, Hospitals, Telephone exchanges and industries etc. Read more about UPS - Uninterrupted Power Supply