A 4:1 step down transformer draws 115 V and 1 A. The output power will be
- 28.5 V at 16 A.
- 460 V at 0.25 A.
- 28.5 V at 4 A.
Explanation
In an ideal transformer input power equals output power. The input is 115 V x 1 A = 115 W, and a 4:1 step-down divides voltage by four (115/4 is about 28.5 V) while multiplying current by four (1 A x 4 = 4 A). The product 28.5 V x 4 A is about 115 W, confirming power is conserved. The 460 V option wrongly steps voltage up instead of down.
Jordi asking:
why?
Community Comments (3)
F
FEDERICOB Posts: 6 12.04.2021 / 18:52
Id a step-down transformer, so based on the turn ratio of 4, you do 115:4=~28,5V and for the current 1*4=4A
F
FEDERICOB Posts: 6 12.04.2021 / 18:53
Id a step-down transformer, so based on the turn ratio of 4, you do 115:4=~28,5V and for the current 1*4=4A
J
Jordi Posts: 198 12.04.2021 / 19:51
Thank you man.I managed to pass this module with the second try .
Please Sign In to post a comment.