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Bumek [7]
3 years ago
10

A transformer is to be used to provide power for a computer disk drive that needs 6.4 V (rms) instead of the 120 V (rms) from th

e wall outlet. The number of turns in the primary is 300, and it delivers 500 mA (the secondary current) at an output voltage of 6.4 V (rms). (a) Should the transformer have more turns in the secondary compared to the primary, or fewer turns
Engineering
1 answer:
SVETLANKA909090 [29]3 years ago
8 0

Answer:

The secondary coil should have fewer turns compared to the primary coil.

Explanation:

N_p = Number of turns in primary coil = 300

N_s = Number of turns in secondary

V_p = Voltage in primary coil = 120 V

V_s = Voltage in secondary coil = 6.4 V

We have the relation

\dfrac{N_p}{N_s}=\dfrac{V_p}{V_s}\\\Rightarrow N_s=\dfrac{N_p}{V_p}\times V_s\\\Rightarrow N_s=\dfrac{300}{120}\times 6.4\\\Rightarrow N_s=16

The secondary coil has 16 turns which is less than the turns in the primary coil.

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