Two strain gauges with a gauge factor K (which will be the last 2 digits of your student number) are placed on the chest and belly (diaphragm) area of a subject as shown in below figure. The gauges have an initial resistance of 1000 and they are connected to the given Wheatstone Bridge circuit. And output of Wheatstone Bridge circuit is connected to an instrumentation amplifier as shown in below figure. The gauges measures the extension of chest and belly according to respiration. The resistance values for amplifier is given below. Rs = R2 = R4 = 1kN, R. = 1000, Rp = 5000, Vcc = 5V When the subject exhaled the strain gauges are relaxed and when the subject inhaled strain gauge A is stretched 1% and B is stretched 2%. Answer the below questions when the subject is inhaled. 21- What will be the resistance value in the strain gauge A, RA ? 22- What will be the resistance value in the strain gauge B, Rs ? 23- What will be the voltage difference Va-Va ? 24- What will be the amplifier output Vo1 ? Strain Gauge A Strain Gauge B R2 R4 VA RA Rs RC Voi Rp Vcc RB RC Rs R2 R4 VB 2

Introductory Circuit Analysis (13th Edition)
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Two strain gauges with a gauge factor K (which will be the last 2 digits of your student number) are placed
on the chest and belly (diaphragm) area of a subject as shown in below figure. The gauges have an initial
resistance of 1000 and they are connected to the given Wheatstone Bridge circuit. And output of
Wheatstone Bridge circuit is connected to an instrumentation amplifier as shown in below figure. The
gauges measures the extension of chest and belly according to respiration. The resistance values for
amplifier is given below.
Rs = R, = R4 = 1kN, R. = 1000, Rp = 5000 , Vcc = 5V
When the subject exhaled the strain gauges are relaxed and when the subject inhaled strain gauge A is
stretched 1% and B is stretched 2%. Answer the below questions when the subject is inhaled.
21- What will be the resistance value in the strain gauge A, RA ?
22- What will be the resistance value in the strain gauge B, Rs ?
23- What will be the voltage difference Vg-VA ?
24- What will be the amplifier output Vo1 ?
Strain
Gauge A
Strain
Gauge B
R2
R4
VA
1
RA
Rs
RC
Voi
Rp
Vcc
RB
RO
Rs
R2
R4
VB
2
3.
Transcribed Image Text:Two strain gauges with a gauge factor K (which will be the last 2 digits of your student number) are placed on the chest and belly (diaphragm) area of a subject as shown in below figure. The gauges have an initial resistance of 1000 and they are connected to the given Wheatstone Bridge circuit. And output of Wheatstone Bridge circuit is connected to an instrumentation amplifier as shown in below figure. The gauges measures the extension of chest and belly according to respiration. The resistance values for amplifier is given below. Rs = R, = R4 = 1kN, R. = 1000, Rp = 5000 , Vcc = 5V When the subject exhaled the strain gauges are relaxed and when the subject inhaled strain gauge A is stretched 1% and B is stretched 2%. Answer the below questions when the subject is inhaled. 21- What will be the resistance value in the strain gauge A, RA ? 22- What will be the resistance value in the strain gauge B, Rs ? 23- What will be the voltage difference Vg-VA ? 24- What will be the amplifier output Vo1 ? Strain Gauge A Strain Gauge B R2 R4 VA 1 RA Rs RC Voi Rp Vcc RB RO Rs R2 R4 VB 2 3.
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