Question 460: AC fundamentals

Question

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?

Accepted Answer

Power loss = 0
$$\eta $$ = 100%
P
in
= P
o/p
V
P
I
p
= V
S
I
s
220 $$	imes$$ I
p
= 44
I
p
= $${{44} \over {220}} = {1 \over 5}$$A = .2A

Answer

4A

Answer

0.2A

Answer

0.4A

Answer

2A

AC fundamentals

A step down transformer connected to an ac mains supply of 220 V is made to operate at 11 V, 44W lamp. Ignoring power losses in the transformer, what is the current in the primary circuit ?

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