Question

# A step down transformer is used on a $$1000$$V line to deliver $$20$$A at $$120$$V  at the secondary coil If the the efficiency of the transformer is $$80\%$$ the current drawn from the lines is

A
3A
B
30A
C
0.3A
D
2.4A

Solution

## The correct option is A $$3$$AEfficient of transformer $$=\dfrac { Power\quad output }{ Power\quad input } \times 100$$$$\Rightarrow \dfrac { 80 }{ 100 } =\dfrac { { V }_{ 2 }{ I }_{ 2 } }{ { V }_{ 1 }{ I }_{ 1 } }$$$$\Rightarrow \dfrac { 80 }{ 100 } =\dfrac { 120\times 20 }{ 1000\times \pm 1 }$$$${ I }_{ 1 }=3A$$.Physics

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