28 - Electromagnetic Induction

Question 1

Electromagnetic Induction

Accepted Answer

Occurs when an emf is induced in a coil due to a changing magnetic flux

Question 2

Magnetic Flux

Accepted Answer

Formula Φ = BA (LOG TABLES)

Question 3

The Weber

Accepted Answer

If the magnetic flux density over an area of 1 m² is 1 tesla then the flux through the area is 1 weber.

Question 4

Faraday's Law of Electromagnetic Induction

Accepted Answer

states that the size of the induced emf is directly proportional to the rate of change of flux.

Question 5

E = – (dΦ ÷ dt)

Accepted Answer

E = – N (dΦ ÷ dt) where N = number of turns

Question 6

Lenz's law of Electromagnetic Induction

Accepted Answer

the direction of the induced emf opposes the change causing it.

Question 7

Electrical Generator

Accepted Answer

A device that converts mechanical energy to electrical energy

Question 8

Mutual Induction

Accepted Answer

Occurs in two adjacent coils when the magnetic field in one coil changes and an emf is induced in the other

Question 9

Self Induction

Accepted Answer

A changing magnetic field in a coil induces an emf in the coil itself

Question 10

Transformer

Accepted Answer

A device which changes the value of an alternating current

Alle Karten