electrical supplies for electronic circuits

Question 1

step-down transformers have

Answer 1

fewer turns in the secondary coil than in the primary coil

Question 2

equation between the primary and secondary voltages:

Answer 2

Vs = ns divided by np x Vp

Question 3

the frequency of Vs is equal to

Answer 3

the mains frequency of 50Hz

Question 4

the secondary voltage may be changed to any value by changing

Answer 4

the number of turns in the coils

Question 5

the process of converting a.c. to d.c. is called

Answer 5

rectification

Question 6

the part of a circuit that makes the change from a.c. to d.c. is called a

Answer 6

rectifier

Question 7

diodes are the active components of

Answer 7

rectifiers

Question 8

when the diode is on a positive terminal of a rectifier, it

Answer 8

conducts and there is a p.d. across the resistor

Question 9

when the diode is on a negative terminal of a rectifier, it

Answer 9

doesn’t conduct and the p.d. across the resistor is 0

Question 10

in a full wave rectifier, the output is

Answer 10

changing rapidly from 0 to its peak value and back to 0 all the time

Question 11

in a half-wave rectifier, the output

Answer 11

voltage is 0 half the time, and for the rest of the time its changing rapidly from 0 to it’s peak values and back to 0