Question

Consider the two methods to measure the resistance of a resistor, as shown in the figures below the two-point probe method and the four-point probe method. Assume that the actual resistance of the resistor is 100 Ω, the resistance of the connecting wires is 10 Ω, the internal resistance of the ammeter is 0 Ω, and the internal resistance of the voltmeter is infinitely large 1) Determine the ammeter reading (it is equal to the current from the power supply) that there is no current flowing through the voltmeter, due to its infinitely large For each configuration 2) Determine the voltmeter reading (it is equal to voltage between points A and B). Note resistance 3) Calculate the experimental value of the resistor's resistance voltmeter reading ammeter reading exp and compare it to the actual value of the resistor's resistance 10Ω 10Ω 3V 100 Ω 3V 100 Ω 10Ω 10Ω 10Ω Two-Point Probe Method Four-Point Probe Method Which method gives a more accurate value of the resistor's resistance?

Answer 1

ton 10.2 on Sloos 31 žiover LWB Yior lon (10+10+ loo B. 102. Two point probe method Four point probe Method 1. Ammeter Reaching, 1.) Ammeter Reading i=13 = 0.025 A. i 5. à 0.025A. 1. (104 10+16) - 2.) Voltmeter Reading, 2.) voltmeter Reading VAB = 120x0.025 = 3 volt. Vag= looxo.025 = 2,5 volt 3.) Experimental value 4.) Experimental value of resistor's resistance, I of resister's resistance, Reap = (Vas - 10.02) - 120 02 Reap: (V) (2013) 1oor The actual value of resistor's resistance is Recture = 100.2 . Therefore, Four Point Probe Method gives a more accurate value of resister's resistance