Using a Multimeter

This review lab consisted of getting reacquainted with the multimeter from what we learned in Physics 4B.

We set up the multimeter to measure resistance and measure resistance of air, the probes, and 4 different resistors. For my resistors I chose 100, 220, 39, and 6700 ohm resistors.

The color coding for these resistors were brown/black/brown, red/red/brown, orange/white/black, and blue/grey/red, respectively.

We then set up the multimeter to measure voltage. Since we are measuring voltage from a transformer, which outputs DC voltage, it does not alternate. We use the DC voltage setting to measure DC voltage. I measured my transformer to be at 36.71 V.


For the next section we set up the described circuit on our breadboard. Our measured voltage across the resistor is 2.41 V and across the LED is 2.13 V. Together they sum up to roughly the voltage drop across the battery, which is 4.55 V.

We then measure the current across the entire circuit, which ends up being around 15.6 mA.