Alternating Currents & Potential Differences An alternating current (a.c) is defined as: A current which periodically varies between a positive and negative value This means the direction of an...
Faraday's Law Faraday's Law connects the?rate?of change of?flux linkage?with induced e.m.f It is defined in words as: The magnitude of the induced e.m.f is directly proportional to the rate of chan...
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 E.M.F between Linked Coils An?e.m.f?can be induced in a coil when there is a change of current in another coil linked with this coil This is what happens in a?transformer Transformers A tra...
Induced E.M.F in a Moving Coil Electromagnetic induction is a phenomenon which occurs when an?e.m.f?is induced when a conductor moves through a magnetic field If there is a change in?magnetic flux?...
Magnetic Force on a Current-Carrying Conductor A current-carrying conductor produces its own?magnetic field An?external magnetic field?will therefore exert a?magnetic?force?on it A current-c...
Magnetic Force on a Charged Particle The magnetic force on an isolated moving charged particle, such as a proton, is given by the equation: F?=?BQv Where: F?= magnetic force on the particle (N) B?=...
Magnetic Flux, Flux Density & Flux Linkage Magnetic Flux Density The strength of a magnetic field is defined by the density of the magnetic field lines, or?magnetic flux density, at that point ...
Exponential Discharge in a Capacitor The Discharge Equation When a capacitor discharges through a resistor, the charge stored on it decreases?exponentially The amount of charge remaining on the cap...
