Transformers and linear regulators

Question 1

What are transformers used for

Answer 1

Converting from AC at one level to AC at another level

AC-AC conversion

Question 2

What are some advantages of transformers

Answer 2

Electrically safe and very high efficiencies (98%)

Question 3

What are some disadvantages of transformers

Answer 3

Large and bulky, loud

Question 4

How would you relate E (e.m.f on coil) with voltage, current and number of turns on the coil

Answer 4

E1/E2 = V1/V2 = N1/N2 = I2/I1

Question 5

What is the equation for efficiency of a transformer

Answer 5

efficiency = (output power)/(output power + copper losses + iron losses)

Question 6

When would regulation take place

Answer 6

Between smoothing and protection

Question 7

Where would a linear regulator be found

Answer 7

Between smoothing capacitor and load