What is a Transformer And How Does it Woks | Power Transmission

What is a Transformer? A transformer is a passive electrical device that transfers electrical energy from one circuit to another circuit by changing the voltage and current levels. It works based on the principle of electromagnetic induction. Here's a breakdown of its key points: Input and Output: A transformer has two main sets of coils: the primary coil (receives input voltage) and the secondary coil (delivers output voltage). Voltage and Current Change: The transformer can either increase (step-up) or decrease (step-down) the voltage based on the ratio of the number of turns in the primary and secondary coils. No Power Creation: A transformer doesn't create new energy; it simply changes the voltage and current levels while maintaining the overall power (energy) in the circuit (following the law of energy conservation). How Does a Transformer Work? Here's a simplified explanation of how a transformer operates: Alternating Current (AC): Transformers work with alternating current (AC), where the direction of electron flow changes periodically. Magnetic Field: When an AC current passes through the primary coil, it generates a magnetic field that expands and collapses continuously. Electromagnetic Induction: This changing magnetic field induces a current in the secondary coil due to the principle of electromagnetic induction. Voltage Change: The voltage induced in the secondary coil depends on the ratio of the number of turns in the primary and secondary coils. More Turns (Secondary): If the secondary coil has more turns than the primary, the voltage gets stepped-up (increased). Less Turns (Secondary): If the secondary coil has fewer turns, the voltage gets stepped-down (decreased). Energy Transfer: The AC current is transferred from the primary circuit to the secondary circuit through the changing magnetic field. Applications of Transformers: Transformers are crucial components in various applications: