EM Induction

Question 1

what does emf stand for?

Answer 1

electromagnetic force

Question 1

a process which electric current is generated by varying magnetic fields

Answer 1

electromagnetic induction

Question 2

what is DC?

Answer 2

direct current

Question 3

what is AC?

Answer 3

alternative current

Question 4

current flows only one direction

Answer 4

direct current

Question 5

what does the CRO mean?

Answer 5

cathode ray oscilloscope

Question 6

UK mains is about 230V, with a frequency of 50Hz

Answer 6

alternating current

Question 7

current constantly changes direction

Answer 7

alternating direction

Question 8

what is aka alternators?

Answer 8

AC generators

Question 9

generators

Answer 9

device that turns mechanical energy to kinetic energy for use in an external circuit

Question 10

to build a generator you need…

Answer 10

moving wire
magnetic field

Question 11

what is the formula of magnetic flux?

Answer 11

ΦB = BA(Cosθ)

Question 12

what is the unit of magnetic flux?

Answer 12

Wb (Weber)

Question 13

number of magnetic fields lines passing through a given closed surface

Answer 13

magnetic flux

Question 14

what is the formula for lenz’s law?

Answer 14

ϵ = − Φ B / t (1 loop)
ϵ = − N x Φ B / t (N loops)