A step-up transformer used on a 120 V line has 95 turns on the primary and 2850 turns on the secondary. What is the emf across the secondary?
A. 30 V
B. 1800 V
C. 2400 V
D. 3600 V
3600 V
120 * (2850 / 95)
wdf
To find the electromotive force (emf) across the secondary of the step-up transformer, we need to use the transformer equation:
Vp/Vs = Np/Ns
Where:
Vp is the voltage across the primary (120 V in this case)
Vs is the voltage across the secondary (which is what we're looking for)
Np is the number of turns on the primary (95 in this case)
Ns is the number of turns on the secondary (2850 in this case)
Rearranging the equation to solve for Vs:
Vs = Vp * Ns / Np
Plugging in the values:
Vs = 120 V * 2850 turns / 95 turns
Vs = 3600 V
So the emf across the secondary is 3600 V.
Therefore, the correct answer is option D. 3600 V.