Knowledge Unbox

Working of Transformer:- What is transformer? An apparatus used for reducing or increasing the voltage of alternating current is known as transformer. OR Transformer is a static device which is used to transfer electrical energy from one circuit to another circuit (which are electrically isolated but magnetically coupled) without changing frequency. Principle of Transformer:-               Transformer works on the principle of mutually induced EMF. When an AC supply is connected to the primary winding this AC current will produce a changing magnetic field surrounding the primary winding. This changing magnetic flux or field will travel through the core and links with the secondary winding to induce an EMF in the coil. Types of Transformer:-         There are many types of transformer based on their construction, supply, uses, cooling, voltage, etc. Some of them are: - core type and shell type X’mer, s...

Working of Generator:- What is a generator? An electric device which converts mechanical energy into electrical energy is called an electric generator. OR It is a device that converts one form of energy into another, especially mechanical energy into electrical energy, as a dynamo, or electrical energy into sound, as an acoustic generator. Principle of an electric generator:- Electric generator works on the principle of electromagnetic induction. When the coil of electric generator cuts the magnetic field, the magnetic field induces a current in the coil. This induced current then flows through the circuit connected to the coil. Types of Generators:-        1.   AC generator.        2.   DC generator. Electromagnetic Induction:- If a metallic conductor is moving inside a magnetic field or magnetic field is changing or not stable around a fixed conductor, a current is generated in that conductor. Thi...

Working of DC Electric Motor:- What is a DC electric motor? An electric motor is an electronic device which converts the electrical energy into the mechanical energy. Principle of a DC electric motor:- The electric motor works on the principle that the current passed through a conductor which is placed in a magnetic field will experience a jerk or a force. Fleming’s left hand rule:- As shown in the figure stretch your forefinger, center finger and the thumb such they are perfectly perpendicular to each other. Suppose if your forefinger shows the direction of the magnetic field and the center finger shows the direction of the current, then the thumb will point towards the direction of motion of the conductor. Working of DC electric motor:- When the current is passed the coil ABCD, the arm AB and CD experiences a force. According to Fleming’s l...