Principle, Working and Advantages of Amplifier

Principle, Working and Advantages of Amplifier Points : Definition, Principle Working and Advantages of Amplifier Definition Amplifier is a device use to increase the amplitude of an input signal (current or voltage) without changing the shape of wave. Principle In transistors a small change in the base current produce a large change in the collector current. Due to this characteristic a transistor is used as an amplifier. Working In electrical circuits a small base current to a transistor release a large collector current, which is used to operate electrical devices such as .lamp, loud speaker etc. Thus transistor is used as a switching device. Advantages of Transistors • Transistors are small in size.
• Transistors are light in weight.
• Transistors are not easily broken.
• Transistors produce little heat.
• Transistors use very little potential.
• Transistors are very cheap.
• Transistors have long operating life. Electrical Instruments in Which Transistors are Used • Audio and video recorders
• Voltage stabilizer
• Television
• Telephone
• Computers
• Radio