College Physics
OER 2016 Edition
ISBN: 9781947172173
Author: OpenStax
Publisher: OpenStax College
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Textbook Question
Chapter 20, Problem 83PE
Find the time after t = 0 when the instantaneous voltage of 60-Hz AC first reaches the following values: (a) V0/2 (b) v0 (c) 0.
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(b)
Two units of DC voltmeters, A and B are used to measure a voltage from a resistor R2 as in
Figure Q4 (b).
These instrument specifications are stated as below:
Meter A: Sensitivity S = 3 kN/V, Internal Resistance Rm = 0.5 kN, Range = 15 V
%3D
Meter B: Sensitivity S = 15 kN/V, Internal Resistance Rm = 3 kN, Range = 20 V
%3D
Ri=5kQ
30 V
RF 25k2
Figure Q4(b)
Calculate:
(i)
Voltage across R2 without any instrument connected.
(ii)
Voltage across R2 using instrument A.
(iii)
Voltage across R2 using instrument B.
(iv)
Absolute error for each measurement.
(A) -3.7 V
B
What is the peak output voltage during negative cycle?
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-11.3 V
-2.7 V
Vi
15 V
Vm
fix
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-15 V
-12 V
T
t
3 V
Si
R
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0
(c)
For the circuit shown in Figure Q1 (c), find the unknown quantities
(Voltage E, Currents I l2, I3 and R3) using the information provided.
2 A
E
ま6n
U 6
R
RT
P = 12 W
Figure Q1 (c)
Chapter 20 Solutions
College Physics
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