Home
Class 12
PHYSICS
A transformer has an efficiency of 80%. ...

A transformer has an efficiency of 80%. It is connected to a power input of 5 kW at 200 V. If the secondary voltage is 250 V, the primary and secondary currens are respectively

A

25 A, 20 A

B

20 A, 16 A

C

25 A, 16 A

D

40 A, 16 A

Text Solution

Verified by Experts

The correct Answer is:
C
Efficiency = `("output power")/("input power")`
Input power = `5000W`,
Input voltage = `200 V`
`therefore` Primary current, `I_(p)=(5000)/(200)`
`=25A`
Output power = `5000xx(80)/(100)`
`=4000 W`
Output voltage = `250V`
Secondary current, `I_(s)=(4000)/(250)=16A`
Promotional Banner

Similar Questions

Explore conceptually related problems

In a transformer without any loss in power , there are 5000 turns in the primary and 250 turns in the secondary. The primary voltage is 120 V and the primary current is 0.1 A. Find the voltage and current in the secondary.

A transformer without power loss carries 4000 turns in the primary and 2000 turns in thw secondary. If the primary voltage is 120 V and the current is 0.2 A . Where are the thick wires to be used in this transformer - in the primary or secondary ? why ?