0195136047.pdf

64 CIRCUIT CONCEPTS

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5 A 5 Ω 10 V

Figure P1.3.7

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IS 5 Ω

10 Ω

5 10 Ω V^0 = 10 V

V 1

Figure P1.3.8

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1 F 1 F

1 H

Source 2 Ω v(t)

i(t)

B

A

Figure P1.3.9

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2.5 V

5000 Ω 10,000 Ω

V 1 − 105 V 1 Vout

Figure P1.3.10

degree Celsius. If the temperature at the time of
measurement is 20°C above ambient, compare the
percent error of both meters when measuring a
current of 5 A.
1.4.4A DMM (digital multimeter) reads true rms values
of current. If the peak value of each of the follow-
ing periodic current waves is 5 A, find the meter
reading for: (a) a sine wave, (b) a square wave, (c)
a triangular wave, and (d) a sawtooth wave.
1.4.5Consider the bridge circuit given in Figure P1.4.5
withR 1 =24 k, R 2 =48 k, andR 3 =10 k.
FindR 4 when the bridge is balanced withV 1 =0.
*1.4.6In the Wheatstone bridge circuit shown in Figure
P1.4.6,R 1 = 16 , R 2 = 8 , andR 3 = 40 ;R 4

is the unknown resistance.RMis the galvanometer

resistance of 6. If no current is detected by the

galvanometer, when a 24-V source with a 12-

internal resistance is applied across terminalsa–b,

find: (a)R 4 , and (b) the current throughR 4.

1.4.7Three waveforms seen on an oscilloscope are

shown in Figure P1.4.7. If the horizontal scale

is set to 50 ms per division (500 ms for the en-

tire screen width), and the vertical scale is set

to 5 mV per division (±25 mV for the entire

screen height with zero voltage at the center),

determine: (i) the maximum value of the volt-

age, and (ii) the frequency for each of the wave-

forms.