FreeNotes
Transformer: A transformer is an electrical device used to change the voltage level of an alternating current (AC) in a circuit. It operates on the principle of electromagnetic induction to either step up (increase) or step down (decrease) the voltage. It works only with AC and is widely used in power transmission, electrical appliances, and … Read more
Mutual Induction is a phenomenon where a change in current in one coil induces a voltage in a second nearby coil due to the magnetic field created by the first coil. This principle is based on Faraday’s Law of Electromagnetic Induction and plays a key role in many electrical devices such as transformers, inductors, and … Read more
An AC generator, also known as an alternator, is a device that converts mechanical energy into electrical energy by the process of electromagnetic induction. It produces alternating current (AC), which periodically reverses direction, in contrast to direct current (DC), which flows in one direction only. Construction of an AC Generator: The main components of an … Read more
To show that the induced current and induced electromotive force (emf) in a circuit follow the law of conservation of energy, we need to connect the concept of electromagnetic induction to the physical principle of energy conservation. Key Concepts: Faraday’s Law of Induction states that the induced emf (ε) in a loop is proportional to … Read more
Electromagnetic Induction: Electromagnetic induction is the process by which a changing magnetic field induces an electromotive force (emf) or voltage in a conductor. This phenomenon is described by Faraday’s Law of Induction, which states that the magnitude of the induced emf is proportional to the rate of change of the magnetic flux through a circuit. … Read more
What is a DC Motor? A DC motor (Direct Current motor) is an electric motor that runs on direct current (DC) electricity. It converts electrical energy into mechanical energy through the interaction of magnetic fields. DC motors are commonly used in applications where precise control of speed and torque is required, such as in electric … Read more
When a current-carrying coil is placed in a magnetic field, the interaction between the magnetic field and the current in the coil generates a torque. This torque tends to rotate the coil, and it’s the fundamental working principle behind electric motors. Why is Torque Applied on a Current-Carrying Coil? A current-carrying coil in a magnetic … Read more
The force applied on a current-carrying conductor in an external magnetic field arises due to the interaction between the magnetic field and the moving charged particles (electrons) in the conductor. When a current flows through a conductor, the electrons experience a force due to the magnetic field, which results in a net force on the … Read more
What is a Solenoid? A solenoid is a long coil of wire, typically wound in the shape of a cylinder, through which an electric current passes. It is designed to create a uniform magnetic field inside the coil and a more complex, weaker magnetic field outside it. Solenoids are commonly used in electromagnets, electric relays, … Read more
The magnetic field produced around a straight current-carrying conductor is a circular field that surrounds the wire. The direction of the magnetic field lines is determined by the current flowing through the conductor and can be described using Ampère’s Circuital Law. Magnetic Field Around a Straight Conductor: When an electric current flows through a conductor … Read more