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Electric Current Case Report

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AEF Assignment
DEADLINE 3 February 2015
(Group Report)
Illustrate the relationship between Electric Current and Magnetic Field.

Md Hisham (13)
Md Farith (14)
Casper Teng (2)
Md Ruzaini (20)
Daniel Deskar (6)
Tijany Sulaiman (28)

1. What is electric current?

A movement or flow of electrically charged particles, typically measured in amperes. An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma. Electric current can consist of a flow of charged particles in either direction. The conventional symbol for current is I

1. Working principles of Electric Current. …show more content…
Its is one of two ways to expressed a magnetic intensity.
SI unit of measurement = Ampere per metre (A/m)
SI symbol = ’H’
H = MMF / L = IN / L where ‘L’ is the length of the coil
The Magnetic Field Strength is inversely proportional to the length of the soil. The longer the length the lesser the magnetic field strength.
7) Induction
There are 2 laws of induction - Faraday’s and Lenz’s Laws.
Faraday’s Law states that a changing magnetic flux passing a conductor will induce an EMF and the size of the induced EMF is proportional to the rate of change of flux.
Lenz’s Law states that an induced EMF generates a current that induces a counter magnetic field (Field B) that opposes the magnetic field (Field A) generating the current.
Faraday’s Law states the relationship between rate of change of magnetic flux to induced EMF. Lenz’s Law defines the polarity of the induced EMF. Therefore a combination of the the two is optimal in defining …show more content…
Since the aircraft battery has a short-term power shortage capability, the AC generator is needed as to provide back-up power for the aircraft. Main advantage of AC power is that it can operate at a higher voltage as compared to DC power which are usually limited to around 400W to 12kW. In the transmission of AC power, it is important that high voltages are produced so as lower current will be produced and this leads to lower losses. This means that by lowering the current saves weight as heavy current conductors can be eliminated and this is a very important consideration for an aircraft

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