7.10 AC/DC Current Measurement 21
8. Basic Concepts 22
8.1 Ohm's Law 22
8.1.1 Example 22
8.2 Joule's Law for Electrical Power 25
8.2.1 Example 25
8.3 Kirchhoff's Law 27
8.3.1 Kirchhoff's Current Law 27
8.3.2 Kirchhoff's Voltage Law 28
8.3.3 Example 28
8.4 Shunt Resistor 32
8.4.1 Example 33
8.5 Choosing the Right Resistor for an LED 35
8.5.1 Example 36
8.6 Measuring Internal Resistance of a Battery 39
8.6.1 Example 40
8.7 Testing Some Components Using Multimeter 41
8.7.1 Potentiometer Test 41
8.7.2 BJT Transistor Test 43
Safety Specifications and Instructions
The meter conforms to IEC61010-1 (CAT.) III 600 V overvoltage safety standard and pollution level 2.
operation that may cause damage to equipment
operation that may cause damage to users
Before using the meter, please read the printed manual carefully (the printed one that comes with the
multimeter kit) and pay particular attention to the safety information to avoid possible electric shock or
personal injury.
In general, if something unusual happens or if you suspect that something is wrong or has
malfunctioned, do not do anything with the product and immediately contact the seller for assistance
(email address: office@plusivo.com)
2
Mastering the Art of Measurement (DM401B Smart Digital Multimeter) r.01 www.plusivo.com
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