Electromagnetic Induction Flashcards
what is electromotive force?
The work done or energy per unit charge around the whole circuit by an energy source, such as a battery
what is electromotive force measured in
volts
formula for electromotive force
emf (volts) = work (J) / charge (C)
what is faraday’s law
A wire close to a constantly changing magnetic field will experience an induced electromotive force
what is faraday’s law
A wire close to a constantly changing magnetic field will experience an induced electromotive force
what are two ways to induce emf
- Moving a magnet so that its field lines are cut by a wire.
- Moving a wire across a magnetic field.
what does each finger do in fleming’s right hand rule
- ThuMb: Motion
- First finger: magnetic Field
- SeCond finger: Current
when is fleming’s right hand rule used
when a force acts on a conductor perpendicular to a magnetic field.
what is Lenz’s law
The direction of the induced e.m.f. opposes the change that creates it.
how to increase emf induced
- Increase strength of magnet -
- Increase speed of motion
- Increase force of motion
- Increase number of turns in coil
how to represent current coming out of the page
circle with dot
how to represent current going into the page
circle with cross
