Electrodynamic

Question 1

Faradays law

Answer 1

The emf induced is directly proportional to the rate of change of the magnetic flux ( flux linkage)

Question 2

AC

Answer 2

Alternating current. Current which reverses direction periodically

Question 3

Commutator

Answer 3

A device which ensures that that the direction of the current in a coil is reversed every half revolution

Question 4

DC

Answer 4

Direct current. Current flowing in one direction only

Question 5

Electromagnetic induction

Answer 5

Occurs when a current is induced in a closed conducting loop when there is a change the magnetic flux passing though the surface area of the conducting loop

Question 6

Induced EMF

Answer 6

The total amount of electricity energy supplied per unit positive charge

Question 7

Magnetic flux density

Answer 7

A representation of the magnitude and direction of the magnetic field

Question 8

Magnetic flux

Answer 8

For a loop of area (A) in the prévenue of a uniform magnetic flux desire (B), the magnetic flux (§)passing through the loops is defined as §=BAcosæ where æ is the angle between the magnetic flux destiny (B) and the normal to the loop of the area (A)

Question 9

Magnetic flux linkage

Answer 9

The product of the number of turns on a coil and the flux through a could (N§)

Question 10

Lenz ’s law

Answer 10

The induced current flows in a direction so as to set up a magnetic field to oppose the change in magnetic flux

Question 11

Diode

Answer 11

A component that only allows current to flow in one direction

Question 12

Generator

Answer 12

A device which convers mechanical energy to electrical energy

Question 13

Motor

Answer 13

A device which converts electrical energy into mechanical energy