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
V = \(\sqrt{PR}\)
V = \(\sqrt{40 \times 90}\)
= 60V
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