Physics
JAMB 2015
The r.m.s value of a supply voltage is quoted at 200v. What is the approximate peak value of the voltage?
-
A.
200volts
-
B.
300volts
-
C.
283volts
-
D.
250volts
Correct Answer: Option C
Explanation
V
r.m.s = V
0 ÷ V
2, where V
r.m.s rep. to as voltage root –square mean, v = peak voltage
V
r.m.s = 200volt, v = ?
200 = V
0 ÷ V
2
V
0 = 200
v2
= 200 × 1.414
= 282.8 volts V0 = b &approx.; 283 volts
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