Transformer Calculations The transformer equation is: Where: Ns = number of turns in the secondary coil Np = number of turns in the primary coil εs = output voltage from the secondary coil (V) εp =...
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Step-Up & Step-Down Transformers A transformer is A device that changes high alternating voltage at low current to low alternating voltage at high current, and vice versa This is designed to re...
Root-Mean-Square Current & Voltage Direct current sources provide a constant voltage and current over time, making it easy to measure In situations involving alternating voltage and current, th...
AC Generators If a coil of wire is rotated inside a magnetic field by an external force, an emf will be generated in the wire which causes current to flow within the coil The generator effect can b...
Lenz's Law Lenz’s Law is used to predict the direction of an induced e.m.f in a coil or wire Lenz's Law is summarised below: The induced e.m.f is set up in a direction to produce effects that oppos...
Induced Emf Electromagnetic induction is a phenomenon which occurs when an e.m.f. is induced when a conductor moves through a magnetic field When the conductor cuts through the magnetic field lines...
Emf, Magnetic Flux & Magnetic Flux Linkage Electromagnetic Induction When a conducting wire moves through a magnetic field, a potential difference is created along the wire If the wire is part ...
Forces on Charges & Masses The electric field strength equation can be rearranged for the force F on a charge Q in an electric field E: Where: F = electrostatic force on the charge (N) Q = char...
