Question 5: One transformer has the numbers of turns on primary and

secondary coils as the following respectively:

Primary:

Np = 4000 turns

Secondary: Ns = 500 turns

A sine voltage VP(t) = 120 sin (377t) [V] is applied to primary coil.

a/ Calculate the secondary voltage vs(t) as of a sine function.

b/ If the secondary coil has a center tap which is grounded, write the

voltages vsi(t) and vs2(t) at both secondary terminals referred to ground.