COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 21, Problem 4QAP
To determine
A simple explanation as to why an electric appliance, which is supposed to be operated with a certain root mean square voltage, operated with a slightly increased root mean square voltage will lead to catastrophic results.
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The newest generation of smartphone uses three different batteries connected in series simultaneously to extend battery life and generate the energy necessary to power the device. If each battery is rated at 3.2V, what is the overall voltage provided to the phone.
(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.
For a limited time interval, the voltage across a 1.35 microfarads (or, equivalently,
1.35 x 10-6 farads) capacitor is modelled by
v(t) = 4.05 + 26.3t + 29.1t² volts,
where t is the time in seconds. Recall that, in this case, the current function is given by
i(t) = Cv' (t), where the current, capacitance, and voltage is given in amperes,
farads, and volts, respectively.
(a) Find the current function.
i(t)
=
amperes.
(b) Find the current in milliamperes at 37.5 seconds.
Current to three decimal places =
milliamperes.
Chapter 21 Solutions
COLLEGE PHYSICS
Ch. 21 - Prob. 1QAPCh. 21 - Prob. 2QAPCh. 21 - Prob. 3QAPCh. 21 - Prob. 4QAPCh. 21 - Prob. 5QAPCh. 21 - Prob. 6QAPCh. 21 - Prob. 7QAPCh. 21 - Prob. 8QAPCh. 21 - Prob. 9QAPCh. 21 - Prob. 10QAP
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