Computers are good at reading out voltages, so these devices are often combined

Question

Computers are good at reading out voltages, so these devices are often combined the a fixed-value resistor to create a voltage divider circuit. Consider the circuit shown below where the fixed resistor, R, has a resistance of 14.0 kOhm. and the FSR has a resistance of 50.0 kOhm when there is no force acting on the FSR. A voltage V = 5.00 V is being applied to the two series resistors. What is the current flowing through the FSR when there is no force being applied to the FSR? What is the current flowing through the fixed resistor when there is no force being applied to the FSR? Consider the negative terminal of the voltage source to be at a potential of zero Volts. What is the electric potential (voltage) at the location A between the two resistors? Suppose that if a force of 1.10 N is applied to the FSR, its resistance decreases to 4.00 kOhm. What would be the new current through the fixed resistor, R? What would be the electric potential at Location A between the two resistors with the applied force of 1.10 N?

Explanation / Answer

a)

current = 5/14000+50000

i = 0.078 mA

b)

i = 0.078mA

c)

Va - 0 = iR

Va = 1.09 V

d)

i1 = 5/14000+50000-4000

i1 = 0.0833

e )

Va = i1R

Va = 1.167 V

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