Complete Electrical Machines course for B.Tech EEE and GATE in 80+ video lectures: magnetic circuits, DC machines, single-phase and three-phase transformers, induction motors, alternators and synchronous motors. Watch in order: each lecture builds on the previous one. Modules: 1. Magnetic Circuits & Electromagnetic Induction (Lectures 1A-1R) 2. DC Machines: construction, windings, EMF equation, armature reaction, losses (2A-2J) 3. DC Motors: torque, characteristics, speed control (3A-3C) 4. Single-Phase Transformers: EMF equation, equivalent circuit, OC/SC tests, regulation, efficiency (4A-4H) 5. Three-Phase Transformers: winding connections, vector groups, Scott connection (5A-5D) 6. Three-Phase Induction Motors: rotating magnetic field, torque-slip, equivalent circuit, starting (6A-6K) 8. Alternators (Synchronous Generators): EMF equation, armature reaction, voltage regulation, two-reaction theory (8A-8J) 9. Synchronous Motors: starting, effect of excitation, synchronous condenser, applications (9A-9J) 10. Single-Phase Induction Motors: double revolving field, types, equivalent circuit (10A-10E) Solved problems for every module (Electrical Machines Tutorials): https://www.youtube.com/playlist?list=PL5TKV1tzb09kPh9xyaU8yZC4ph305bTty Notes & more: https://engineeringdevotion.com #ElectricalMachines #ElectricalEngineering #GATEEE
Curated by: Engineering Devotion (81 videos)
A single-phase transformer is a static electrical device that uses electromagnetic induction to transfer AC electrical energy from one circuit to another at the same frequency, but usually at a different voltage level. It consists of two windings, primary and secondary, wound around a common laminated magnetic core. When an AC voltage is applied to the primary, it creates a fluctuating magnetic flux in the core, which in turn induces an electromotive force (EMF) in the secondary winding, allowing power transfer without direct electrical connection. Ideal Conditions for a Single-Phase Transformer: An ideal transformer is a theoretical concept with no losses. Under ideal conditions: No winding resistance: Both primary and secondary windings have zero resistance, meaning no copper losses (I²R losses). No leakage flux: All the magnetic flux produced by the primary winding links perfectly with the secondary winding. No core losses: There are no hysteresis or eddy current losses in the magnetic core. Unity coupling coefficient: The magnetic coupling between the windings is perfect (k=1). No exciting current on no-load: It draws no current when the secondary is open-circuited. EMF Equation of a Single-Phase Transformer: The RMS value of the induced EMF ($E$) in a transformer winding is given by the equation: $E = 4.44 f \Phi_m N$ Where: * $E$ = RMS value of the induced EMF (in Volts) * $f$ = Frequency of the AC supply (in Hertz) * $\Phi_m$ = Maximum value of magnetic flux in the core (in Webers) * $N$ = Number of turns in the winding (primary $N_1$ or secondary $N_2$) Therefore, for the primary winding: $E_1 = 4.44 f \Phi_m N_1$ And for the secondary winding: $E_2 = 4.44 f \Phi_m N_2$ Important Search Queries: How does a single phase transformer work? Single phase transformer construction Types of single phase transformers Applications of single phase transformers Single phase transformer efficiency Transformer voltage and current relationship Ideal transformer characteristics Faraday's law of electromagnetic induction in transformers Transformer losses and their reduction Step-up vs step-down transformer single phase #SinglePhaseTransformer #Transformer #ElectricalEngineering #EMFEquation #IdealTransformer #PowerTransformer #ElectricalDevices #MagneticInduction #StepUpTransformer #StepDownTransformer --- Electrical Machines full course (lectures): https://www.youtube.com/playlist?list=PL5TKV1tzb09lbVthPhckKZ7JsnwHkWmFP Electrical Machines solved problems (tutorials): https://www.youtube.com/playlist?list=PL5TKV1tzb09kPh9xyaU8yZC4ph305bTty Notes & more: https://engineeringdevotion.com