Electricity & Magnetism
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Understanding Volts, Amps, and Ohms in Physics
Physicists measure electric current in amps, electric potential difference in volts, and electrical resistance in ohms. more...
Importance of Maxwell's Equations
Maxwell's equations synthesized physicists' understanding of electrodynamics and predicted the existence of electromagnetic waves. more...
Ampere's Law allows physicists to determine the magnitude and direction of the magnetic field induced by an electric current. more...
The total electric field integrated over a surface enclosing a volume of space gives the total amount of electric charge in that region of space. more...
Magnetic Brakes and Lenz's Law
A fun physics science lab for kids that uses magnets to illustrate Faraday's law and Lenz's law via a magnetic brake effect. more...
A changing magnetic field will induce an electric current and corresponding electric potential difference according to Faraday's Law of electromagnetic induction. more...
Lenz's law, giving the direction of induced electromagnetic fields, is a consequence of the law of conservation of energy. more...
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Functions of a Current Transformer
What is a current transformer and how does a transformer work when used in an AC electrical circuit? more...
By: Martin Bell
Hard Disk Drives (HDDs) are a common data storage device. Data on them are stored using the binary number system, representing 1 and 0 by "North" and "South" magnets. more...
How can power be transmitted from the generating station to the users over large distances? How much of this power is lost and how is cost of consumption calculated? more...
Working Principle of the Electronic Transformer
Transformers are commonly made by winding two coils around an iron core. Their function? Supply voltages needed to drive a myriad of electronic gadgets and equipment. more...
Why is it when a magnet is moved in the direction of a copper wire coil, a current can then be measured in the coil? more...
An electric current creates a curling magnetic field. When placed in an external field, a force acts on the wire. This magnetic force is what drives the electric motor. more...
Magnets are fascinating objects for anyone ranging from the child to the engineer. They can be a source of fun and we can also probe and quantify their curious properties more...
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