Question

If the input power of an ideal transformer is 120W. What will be the power in secondary?​

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 120W.

The input power is calculated as follows.

The input voltage is 220 V and current is 5 A

Power=VI=240×0.6=144W.

So, η=

144

120

×100=83.3%.

Hence, the efficiency of the transformer that lights the bulb is 83.3%.

Answer 2

Answer:

The efficiency of a transformer can be calculated using Equation,

Efficiency=InputpowerofthetransformerOutputpowerofthetransformer=PpPs×100

In this case, the output power is 120W.

The input power is calculated as follows.

The input voltage is 220 V and current is 5 A

Power=VI=240×0.6=144W.

So, η=144120×100=83.3%.