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Electric Circuits 1 - 11 DATA Estimate and record the reading uncertainties in your voltage, current and resistance measurements. Record the value of cach R.V and I in Figure 4 in the format, R+R (units). Direction of the current: With each current measurement, note the direction of the current in the branch as shown in Figure 2. and mark it in Figure 4 with an arrow. 8 V- 1,- R V W E Red + D Green E Rs V, Is = V V. 1,- G H e 2 Figure 4: A circuit to verify Kirchhoff's Rules. Resistance Voltage C imal 1200 70 S. 473 4.65 6.06 S60 10.6 $20 5.56 5.56 0.90 ab 11.7 9,9 R3 Q5 220 NIA
Electric Circuits 11 - 12 CALCULATIONS Verification of Kirchhoff's junction rule We can state the junction rule as follows: The sum of all currents entering a junction = The sum of all currents leaving the same junction The junction rule is valid for any of the junctions in the circuit in Figure 4. We will select only two junctions for further calculations. Junction B: The currents entering junction B The currents leaving junction B Test the junction rule: Junction D: Repeat the above calculation for Junction D.
Electric Circuits II - 13 Verification of Kirchhoff's loop rule We can state the loop rule as follows: Around any closed loop, the sum of the changes in electric potential (ie, the sum of the voltages) is equal to zero. Verify Kirchhoff's loop rule for loops ABDGFA and BCEDB in Figure 4. In order to do this, compare the sum of all positive voltages to the sum of all negative voltages. Loop ABDGFA: Positive voltages: Negative voltages: Test the loop rule: Loop BCEDB: Repeat the above calculation for this loop.