Question 485: AC fundamentals

Question

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is

Accepted Answer

Efficiency of the transformer,
$$\eta $$ =
Output power
Input power
$$ \Rightarrow $$ $${{80} \over {100}} = {{{V_s}{I_s}} \over {{V_p}{I_p}}}$$
$$ \Rightarrow $$ I
p
= $${{440 	imes 2} \over {{{80} \over {100}} 	imes 220}}$$ = 5 A

Answer

3.6 ampere

Answer

2.8 ampere

Answer

2.5 ampere

Answer

5.0 ampere

AC fundamentals

A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0 ampere at 440 volts. If the efficiency of the transformer is 80%, the current drwn by the primary windings of the transformer is

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