a) Explain the main function of a transformer and distinguish between a step-up
ID: 2040603 • Letter: A
Question
a) Explain the main function of a transformer and distinguish between a step-up and a step-down transformer 5. b) It is well known that transformers are intended to operate on alternating current (AC). Will they also work when a steady direct current (DC) is applied? Explain c) A laptop computer is equipped with a 30.0V battery, but can also operate on the 120-Vac from the wall outlet. If the associated power supply contains a transformer that will reduce the 120V to 30V, find the required number of loops on the transformer's secondary coil if the primary coil contains 500 loops.Explanation / Answer
(a) Main function of transformer is to change the voltage of electricity flowing in the circuit. Transformers can be used either to increase the voltage (called "stepping up") or decrease the voltage ("step down").
A transformer that increases voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.
(b) No, if dc supply is given, the current will not change due to constant supply and transformer will not work.
(c) Np = 500
Vp = 120
Vs = 30V
Use:
Ns/Np = Vs/Vp
=> Ns = Np * (Vs/Vp)
= 500 * (30/120)
= 125 turns
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