The input is 115V and is applied across the 300 turn portion of the autotransformer shown. What is the output voltage?
- 115V
- 28V
- 460V
Explanation from PART66Online
In an autotransformer the whole winding sits on one core, so every turn has the same voltage across it. The input puts 115 V across 300 turns, and the output is taken across the full 300 + 900 = 1200 turns, so the output is 115 x 1200 / 300 = 4 x 115 = 460 V, a step-up. The 28 V option applies the 4 to 1 ratio the wrong way (115 / 4 is about 28.75 V), and 115 V ignores the extra turns.
A
arifadli8 asked · 6 Jan 2014
how?
Community Comments (3)
P
PART66Online
9 Jan 2014
Transformator ratio is 300:1200 = 1:4.
Output = 4 * 115V.
Output = 4 * 115V.
T
Thomas2
17 May 2016
but it is 900 turns in the output not 1200 as a given in the diagram .
S
squareroot
18 May 2016
output turn = 300+900 = 1200 turn
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