11. A transformer is needed to convert 120 Volts to 24 Volts before it provides

Question

11. A transformer is needed to convert 120 Volts to 24 Volts before it provides power to your laptop computer. Which os the following statement is true?

a) If 1 amp flows across the primary (high voltage)., 5 amps flow across the secondary (low voltage)

b) If 5 amps flows across the primary (high voltage), 1 amp flows across the secondary (low voltage)

c) If the primary (high voltage) has 100 turns, the secondary (low voltage) has 20 turns

d) If the primary (high voltage) has 20 turns, the secondary (low voltage) has 100 turns

e) a) and c)

f) b) and d)

Explanation / Answer

this is step down tranformer

beacuse it is converting 120 to 24 volt

Vp/Vs = Is/Ip

and Vp/Vs = Np/Ns

here given primary coil voltage = 120 V

secondary coil = 24 V

120/24 = Is/Ip

5 = Is/Ip

5Ip = Is

means If 1 amp flows across the primary (high voltage)., 5 amps flow across the secondary ( a option )

Vp/Vs = Np/Ns

120/24 = Np/Ns

5 = Np/Ns

Np = 5 Ns

If the primary (high voltage) has 100 turns, the secondary (low voltage) has 20 turns

hence

e) a) and c)

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