Motors are a common item that people want to control, and they serve as an excellent example in current measurement. Let's perform an exercise to measure the current used by our DC motor:
Figure 7.2 – R130 DC Motor
A typical size 130 (R130) DC motor is shown in the preceding photograph, together with a set of jumper leads soldered to the motor's terminals so it can be plugged easily into a breadboard. This motor has a red back, however, other colors are common—especially clear/white. The color has no bearing on the motor specifications.
As you proceed with the following steps, please consult your multimeter manual if you are unsure how to place it into current measurement mode.
Here are the steps to follow:
- Connect up a circuit as shown in Figure 7.3:
Figure 7.3 – Measuring current with a multimeter
We are assuming that the motor here is the one mentioned in the Technical requirements section at the...