alternating currents

Question 1

Alternating Current (a.c.) Circuit

alternating currents

Answer 1

a circuit where the direction of its current or polarity of voltage varies periodically with time

Question 2

Period definition

alternating currents

Answer 2

time taken for the current (or voltage) to complete one cycle

Question 3

Frequency definition

alternating currents

Answer 3

the number of times the current passes through its zero value in the same direction in unit time.

Question 4

Peak Value meaning

alternating currents

Answer 4

the maximum value of the current (or voltage) in either direction of the zero value in a periodic cycle.

Question 5

Root-Mean-Square (r.m.s.) Value

alternating currents

Answer 5

the equivalent value of a steady direct current (or voltage) which would dissipate heat at the same average rate in a given resistor

Question 6

Primary Coil vs Secondary Coil

Answer 6

primary coil
- source of emf & pd
- input
- alternate current

secondary coil
- induced emf & pd
- output

Question 7

Ideal Transformer definition

Answer 7

• a device that transforms low alternating voltage to high alternating voltage and vice versa, without any power loss
• power input = power output