4 Point Starter

A 4 Point Starter is almost similar in functional characteristics to 3 Point Starter. In the absence of back EMF, the 4 Point Starter acts as a current limiting device while the starting of the DC motor. 4 Point Starter also acts as a protecting device. The basic difference in 4 Point Starter as compared …

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3 Point Starter

3 Point Starter is a device whose main function is starting and maintaining the speed of the DC shunt motor. The 3 point starter connects the resistance in series with the circuit which reduces the high starting current and hence protects the machines from damage. Mainly there are three main points or terminals in 3 …

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Reverse Bias p n Junction

When the positive terminal of a DC source or battery is connected to n-type, and the negative terminal is connected to the p-type semiconductor of a p n junction, the junction is said to be in Reverse Biasing condition. The diagram of reverse bias p n junction is shown below. In this case, the applied …

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Forward Bias p n Junction

A p n junction is said to be operating under the biasing condition if it is connected across an electric supply. The potential difference across the p n junction can be applied in two ways, namely Forward Biasing and Reverse Biasing. When the positive terminal of a DC source or battery is connected to p-type, …

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Full Wave Bridge Rectifier

In Full Wave Bridge Rectifier, an ordinary transformer is used in place of a center-tapped transformer. The circuit forms a bridge connecting the four diodes D1, D2, D3, and D4. The circuit diagram of the Full Wave Bridge Rectifier is shown below. Contents: Operation of Full Wave Bridge Rectifier Peak Inverse Voltage of Full Wave …

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Center Tapped Full Wave Rectifier

The Center Tapped Full Wave Rectifier employs a transformer with the secondary winding AB tapped at the centre point C. It converts the AC input voltage into DC voltage. The two diode D1, and D2 are connected in the circuit as shown in the circuit diagram below. Contents: Operation of the Center Tapped Full Wave …

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Half Wave and Full Wave Rectifier

In Half Wave Rectifier, when the AC supply is applied at the input, a positive half cycle appears across the load, whereas the negative half cycle is suppressed. This can be done by using the semiconductor PN junction diode. The diode allows the current to flow only in one direction. Thus, converts the AC voltage …

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Semiconductor Diode

A p n junction is known as a Semiconductor Diode. The p n junction is used for the purpose of rectification as it conducts only in one direction. It is also known as crystal diode as it is made of a crystal-like Silicon or Germanium. The symbol of the semiconductor diode is shown below. It …

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p n Junction

When a p-type semiconductor is suitably joined to an n-type semiconductor, the contact surface so formed is called p-n Junction. All the semiconductor devices contain one or more p n junction. The p-n junction is in effect, the control element for semiconductor devices. Formation of p-n Junction In actual practice, the PN junction is not …

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