Engineering 11 Lab 1

Aron Dobos

Adem Kader

09.14.03

Section 1. Confirmation of Ohms Law

Section 3.

Ia. In order for the voltmeter to give an accurate reading, it must behave like an open circuit so that the circuit element under test does not become short circuited. In theory, the voltmeter has infinite resistance.

Ib. In order for an ammeter to give an accurate reading of current, it must behave like a closed circuit (i.e. a short circuit). The ammeter must be placed inside the circuit to measure the current through a point, and consequently it in theory needs to have zero resistance so that the circuit’s behavior is not changed.

Ie. The voltage through a wire is analogous to the pressure of water moving through a pipe. The current is analogous to the amount of water flowing through the pipe per unit time.

IIa. The one change to the function generator is the adjustment of the DC offset setting.

IIb. Image A1 shows AC coupling, and image A2 shows DC coupling. Image A2 cannot possibly be AC coupling, since the alternating current cancels out any vertical voltage offset. Since Image A2 clearly is vertically offset, it can only be DC coupled.

IIc. The trigger level adjustment could account for the change between Image C1 and Image C2. The trigger level changes the threshold voltage at which the oscilloscope captures a new image. The effect of this change is a horizontal shift where the value of the waveform at t=0 is equal to the trigger level.

IId. The trigger slope adjustment could cause the difference between images A1 and C2. The trigger slope changes whether the scope is triggered on the positive slope of the waveform or the negative slope, so changing it would make it appear as though the waveform was inverted.