Magnetism & Electromagnetism Flashcards
What does the strength of the magnetic field depend on?
The currents and the number of turns in the coil, the material used in the core of the coil
What is the force perpendicular to in a current-carrying conductor in a magnetic field?
The direct of both the current and magnetic field
What is Flemings left hand rule used for?
To determine the direction of force, current or magnetic field. This forms the basis of the electric motor.
Where are A.C generators used?
In generation of electricity
What does an A.C generator consist of?
A coil of wire rotated between the poles of a magnet
What does the output voltage depend on in transformers?
The number of turns in the secondary compared to the primary coil.
What are the input and output voltages both doing in transformers?
Alternating
How should transformers be treated?
As devices that have an efficiency of 1 (100%)
Why should transformers be seen as devices with an efficiency of 1?
So that the electrical power input is the same as the electrical power output
What is the equation for transformers? (To calculate power input and output)
Ns Vs
—— = ——
Np Vp
