Pre-LAB 6 Preparation: Fundamentals of Circuits IV: Kirchhoff's ...

Fundamentals of Circuits IV: Kirchhoff’s Circuit Rules v 0.31.2.3.Measured Measured Measured TheoreticalR (Ω) ∆V (volts) I = ∆V/R (amps) I (amps)Table 3:Percent discrepancyhappens to the resistance as you turn the knob on the variable resistance clockwise?Counterclockwise?Step 2: Set the variable resistor so that there is 25Ω between the center connection and oneof the other connections.Step 3: Construct the circuit pictured in Fig. 8, using the variable resistor set at 25Ω as R 2 .Step 4: Use the multimeter to measure the current in each branch of the circuit and enter yourdata in table 2. Compare the measured and calculated values of the current by computingthe percent difference in each case.Note: The most accurate and quickest way to measure current with a digital multimeteris to measure the potential difference across each of the resistors and use Ohm’s law tocalculate I from ∆V and R.Question 3.3 How well do your measured currents agree with the theoretical values calculatedusing Kirchhoff’s rules? The multimeter is accurate to about 3%. Do your calculatedand measured values agree to this accuracy?Prediction 3.1 What do you predict will happen to each of the currents as the resistanceof the variable resistor is decreased? That is, will the currents I 1 , I 2 , and I 3 increase ordecrease? Explain your predictions.Step 5: Decrease R 2 by turning the knob on the variable resistor. How good were your predictions?This laboratory exercise has been adapted from the references below.PHYS-204:Physics II Laboratory 14