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JAMB Physics 2017 Paper
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© africaexams.com
Question : 18
Total: 49
When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is
240v
340v
480v
57600v
Validate
Solution:
The relationship between the peak value and r.m.s value of electricity supply is given as
V
r
.
m
.
s
=
V
o
√
2
where V
o
= peak voltage
∴ V
o
= V
r
.
m
.
s
× √2
= 240 × √2
= 339.5v
= 340v
© africaexams.com
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