In a science or electronics class, there are few more useful tools for a student to master than a multimeter. In any electrical circuit, there are three quantities that must be considered: voltage, electrical current, and resistance. Whatever kind of experiment the student may be performing (building a basic circuit to light up an LED with a battery, or testing what is conductive and what is not), a multimeter will give the kind of direct, interpretable results that every experiment relies on. Schools that put their students to work with a multimeter very early on give those students a real advantage because the process of using one in the lab directly bridges the gap between the abstract and the measurable.
In the first place, the device can seem a bit intimidating to a new electronics student at the lab or to someone doing a STEM education project for the first time. It has a variety of switches, a rotary dial with a lot of markings, and two or three separate input terminals. The operation itself is not nearly as complicated as it appears once the different settings have been clearly explained to the student. By explaining the operation to the student in an easy-to-understand format, the use of a multimeter will be a great asset in any science project. This article walks the student through all the features of the multimeter.
A Multimeter and how it works
A multimeter combines several measuring abilities in one handheld instrument. The word “multi-meter” can be broken down into these two words,multi — multiple, meter-measurement. In the older laboratories, separate pieces of equipment dealt with Voltage, current, and resistance. These were called the voltmeter, ammeter, and ohmmeter, respectively. The modern multimeter includes all three in one convenient and portable instrument. This makes it far more user-friendly and practical for student use.
There are two types of multimeters:
● Analog multimeters are those that use a printed scale with a moving needle to show the measurement taken. While rare in schools, they can be quite useful for showing what’s happening in a circuit over a period of time.
● Digital multimeters are the other type and show the measurement as a digital readout. For use in a science lab kit in schools, it is the digital multimeter which must be used as it is the easiest to read, and least susceptible to human error.
Internally, the incoming current will pass through several resistors and other electronic components, converting it into a value that can be displayed. The actual precision of the reading is often down to the quality of the instrument itself, and the more likely reason for a discrepancy will be the user’s failure to switch the instrument to the correct reading setting.
Read More — https://www.iemrobotics.com/blogs/science-kits-blogs/multimeter-guide-for-school-science-projects
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