THE TRAMSFORMERS

Jun 17th, 2015
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INTRODUCTION : The transformer is a device used for converting a low alternating voltage to a high alternating voltage or a high alternating voltage into a low alternating voltage. It is a static electrical device that transfers energy by inductive coupling between its winding circuits.

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accelerationExample 1:A car accelerates from rest to a speed of 36 km/h in 20 seconds. What is the acceleration of the car in m/s2? Solution:The initial velocity is 0 (from rest) and the final velocity is 36 km/h. Henceaverage acceleration = 36 km/h - 020 seconds= 36 km/h20 secondsWe now convert 36 km/h into m/s as follows36 km/h = 36 * 1000 m / 3600 s = 10 m/sHenceaverage acceleration = 10 m/s20 seconds= 0.5 m/s2Example 2:A car slows down from a speed of 72 km/h to rest in 25 seconds. What is the acceleration of the car in m/s2? Solution:The initial velocity is 72 km/h and the final velocity is 0 (rest). Henceaverage acceleration = 0-72 km/h25 seconds= -72 km/h25 secondsWe now convert 72 km/h into m/s as follows36 km/h = 72 * 1000 m / 3600 s = 20 m/sHenceaverage acceleration = - 20 m/s25 seconds= -0.8 m/s2Example 3:A plane has a take off speed of 300 km/h. What is the acceleration in m/s2of the plane if the plane started from rest and took 45 seconds to take off? Solution:The initial velocity is 0 (from rest) and the final velocity is 300 km/h (take off). Henceaverage acceleration = 300 km/h - 045 seconds= 300 km/h45 secondsWe now convert 300 km/h into m/s as follows300 km/h = 300 *

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