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Newnes Circuit Calculations Pocket Book
book

Newnes Circuit Calculations Pocket Book

by Thomas J. Davies
April 2016
Intermediate to advanced content levelIntermediate to advanced
384 pages
12h 56m
English
Newnes
Content preview from Newnes Circuit Calculations Pocket Book
144
Circuit calculations pocket book
Figure
9.4
Voltage
(V)
Time (s)
(a)
Current
(/nA)
d.c. transients 145
1 kft 0.025
MF
CZ] lh-
I o^o I
30 V
Figure
9.5
Notes:
1 The calculations for t = 0 confirm the statement made in (d).
2 The capacitor voltage falls by a factor of 0.632 or 63.2% of its
initial value during one time constant, leaving 36.8 V (36.8%) of
the initial voltage.
3 The capacitor is almost fully discharged after five time constants.
4 y
c
= -VK at all times.
Example 2 Draw up a table of the capacitor and resistance voltages,
and th
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ISBN: 9781483101132