A 40-W instrument has a resistance of 90 Omega ... - JAMB Physics 1993 Question
A 40-W instrument has a resistance of 90(\Omega). On what voltage should it be operated normally?
A
60V
B
150V
C
225V
D
3600V
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Correct Option: A
P = (\frac{V}{R})
V = (\sqrt{PR})
V = (\sqrt{40 \times 90})
= 60V
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