Question

if a transformer steps down 220v to 11v, what ratio of primary turn to secondary turn?​

Answer 1

Answer:

The efficiency of a transformer can be calculated using Equation,

Efficiency=

Inputpowerofthetransformer

Outputpowerofthetransformer

=

P

p

P

s

×100

In this case, the output power is calculated as follows.

The output voltage is 11 V and current is 90 A

Power=VI=11×90=990W.

The input power is calculated as follows.

The input voltage is 220 V and current is 5 A

Power=VI=220×5=1100W.

So, η=

1100

990

×100=90%.

The efficiency of the transformer is 90%.

Explanation:

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