You visited us 1 times! Enjoying our articles? Unlock Full Access!

Average and Instaneous Power

A transformer...

Question

A transformer is used to light a $100 W$ and $110 V$ lamp from a $220 V$ main. If the main current is $0.5 A,$ then efficiency of the transformer is approximately

10 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

30 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

50 %

No worries! We‘ve got your back. Try BYJU‘S free classes today!

90 %

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D $90 %$
$η = \frac{l}{V_{1} l_{1}}$
$η = \frac{100}{100} = 90 %$

Suggest Corrections

Similar questions

100 W - 110 V

220 V

0.5 A

100 W

110 V

220 V

0.5 A

100 W

110 V

220

0.5

A transformer is used to light 100 W – 110 V lamp from 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is

A transformer ia used to light a 100W and 110V lamp from a 220V mains. If the main current is 0.5amp ,the efficiency of the transformer is approx

1)10%

2)30%

3)50%

4)90%

Join BYJU'S Learning Program