Question 225: AC fundamentals

Question

A power transmission line feeds input power at 2300 V to a srep down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90%, the output current would be :

Accepted Answer

Given,
Primary voltage (V
P
) = 2300 V
Primary current (I
P
) = 5A
Secondary voltage (V
S
) = 230 V
efficiency ($$\eta $$) = 90%
We know,
Efficiency ($$\eta $$) = $${{{\mathop{m Sec}
olimits} ondary\,Power} \over {\Pr imary\,\,Power}}$$
$$ 	herefore $$   $$\eta $$ = $${{{P_S}} \over {{P_P}}}$$ = $${{{V_S}\,{I_S}} \over {{V_P}\,{I_P}}}$$
$$ \Rightarrow $$   0.9 = $${{230 	imes {{m I}_S}} \over {2300 	imes 5}}$$
$$ \Rightarrow $$   I = 45 A

Answer

50 A

Answer

45 A

Answer

35 A

Answer

25 A

AC fundamentals

A power transmission line feeds input power at 2300 V to a srep down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5A and its efficiency is 90%, the output current would be :

Choose the correct answer: