1. An ideal transformer has 60 turns on its primary coil and 300 turns on its se
ID: 1699346 • Letter: 1
Question
1. An ideal transformer has 60 turns on its primary coil and 300 turns on its secondary coil. If 120 V at 2.0 A is applied to the primary, what voltage and current are present in the secondary? 2). An object is 12cm in front of a concave mirror, and the image is 3.0cm in front of the mirror. What is the focal length of the mirror? 3).An object is placed at a distance of 30cm from a thin convex lens. The lens has a focal length of 10cm. What are the values respectively of the image distance and lateral magnification? 4). An object is 6.0cm tall, and is in front of a diverging lens. The image is 2.5cm tall, and 7.5 cm from the lens. What is the focal length of the lens?Explanation / Answer
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1) You can use the turns equation and the power equation to find the answers for a 100% efficient transformer
You have given the situation for a step-up transformer where the voltage increases and the current decreases accordingly.
!) For a step up the calculation is as follows
Vs / Vp = Ns / Np
Vs = Vp x Ns / Np = 120 x 300 / 60 = 120 x 5 = 600 v
Vs x Is = Vp x Ip
Is = Vp/ Vs x Ip = 120 / 600 x 2 = 2 / 5 = 0.4 A
2) For a step down the calculation is as follows
Vs / Vp = Ns / Np
Vs = Vp x Ns / Np = 120 x 60 /300 = 120 / 5 = 24 v
Vs x Is = Vp x Ip
Is = Vp/ Vs x Ip = 600/20 x 2 = 5 x 2 = 10 A
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