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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
d.c. supplies 253
Example 16 What would the efficiency of the battery in Example 15
be if the discharge rate had been 30 A for 5 hours?
30 x 5
Efficiency = = 0.78 or 78%
3
24 x 8
(See program 222, page 252.)
(d) Watt-hour efficiency
Average output power x time
Efficiency =
Average input power x time
For the case of constant current charging
Watt-hours = current in amperes x average voltage x time in
hours
Example 17 A battery is fully charged by a constant current of 15 A
flowing for 8 hours. The average charging voltage is 1.8 V. It is
discharged at a constant current of 10 A flowing for 9 hours. If
the average terminal voltage is 1.3 V, calculat ...
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Publisher Resources

ISBN: 9781483101132