Inductors and electro magnetic

Question 1

What is an inductor?

Answer 1

An inductor is a coil wound round a piece of iron

Question 2

What is the symbol and unit?

Answer 2

Circuit Symbol (L)
Unit: Henry (H

Question 3

What do inductors do?

Answer 3

Inductors impede, oppose, try to stop, changes in electric current

Question 4

What is inductance and it’s formula?

Answer 4

The inductance of an inductor give a measure of how much it opposes the change in current according to this simple formula:-
V = Inductance X rate of change of current

Question 5

What are the 3 formulas for impedance?

Answer 5

• XL=ωL
• ω=2πf
• XL=2πfL

Question 6

What is an LC filter circuit?

Answer 6

An LC circuit is made up of an inductor (L) and a capacitor (C). Here, both are connected series.

Question 7

What is an LC circuit also known as?

Answer 7

An LC circuit is also sometimes referred to as a tank circuit, resonant circuit, or tuned circuit

Question 8

How is the ratio of primary voltage to secondary voltage equal to the ratio of primary turns to secondary turns?

Answer 8

Vp / Vs = Np / Ns = Is / Ip

Question 9

How do electric motors work?

Answer 9

They work using magnetic forces which are controlled and created using electric currents.

Question 10

What is the magnetic flux density(B)?

Answer 10

The magnetic flux density or magnetic induction is the number of lines of force passing through a unit area of material measured in Tesla

Question 11

What is the key electro-magnetic formula to find magnetic flux density?

Answer 11

B = 𝝁𝒐 x H
𝝁𝒐 is the permeability of free space
H is magnetic field intensity (Amps/metre)

Question 12

What is magnetic flux?

Answer 12

The total magnetic flux coming out of something like a coil or a magnet, or passing through a coil

Question 13

What is the formula for magnetic flux?

Answer 13

𝜱 = 𝜷 ⋅ A