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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
correct option: a

P = (\frac{V}{R})

V = (\sqrt{PR})

V = (\sqrt{40 \times 90})

= 60V

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