Question on: WAEC Physics - 1991
A house is supplied with a 240V a.c mains. To operate a door bell rated at 8v, a transformer is used if the number of turns in the primary coil of the transformer is 900. calculate the number of turns in the secondary coil of the transformer
A
30
B
240
C
248
D
450
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Correct Option: A
(\frac{E_p}{E_s} = \frac{n_p}{n_s})
ns = 30
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