April 2016
Intermediate to advanced
384 pages
12h 56m
English
Content preview from Newnes Circuit Calculations Pocket Book
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94 Circuit calculations pocket book
Example 9 A mains distribution cable carries 10 kV r.m.s. The
cable insulation is rated at the peak voltage. What is this rating?
K
p
= 10 000 x V2 = 14 142 V = 14.142 kV
(See program 56, page 93.)
6.5
Frequency
Consider again our simple generator. One revolution corresponds
to one cycle (Figure 6.3). Assume that the generator is running at 50
revolutions per second. This would produce 50 cycles per second.
This is called the frequency (hertz). From this it can be seen that
one cycle is produced in a time of 1/50 second. Sine waves therefore
can also be plotted against time.
Frequency and time are related
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