TAILIEUCHUNG - Lab 3.1.2 Voltage Measurement

The digital multimeter is a versatile testing and troubleshooting device. This lab covers both direct current (DC) and alternating current (AC) voltage measurements. Voltage is measured in either AC or DC volts, indicated by a V. Voltage is the pressure that moves electrons through a circuit from one place to another. Voltage differential is essential to the flow of electricity. The voltage differential between a cloud in the sky and the earth is what causes lightning to strike. | Cisco SrsTEMS Lab Voltage Measurement Objective Demonstrate the ability to measure voltage with the multimeter safely. Background The digital multimeter is a versatile testing and troubleshooting device. This lab covers both direct current DC and alternating current AC voltage measurements. Voltage is measured in either AC or DC volts indicated by a V. Voltage is the pressure that moves electrons through a circuit from one place to another. Voltage differential is essential to the flow of electricity. The voltage differential between a cloud in the sky and the earth is what causes lightning to strike. Note It is very important to be careful when taking voltage measurements to avoid an electrical shock. Direct current DC DC voltage rises to a set level and then stays at that level and flows in one direction positive or negative. Batteries produce DC voltage and are commonly rated at or 9v and 6v. Typically the battery in a car or truck is a 12v battery. When an electrical load such as a light bulb or motor is placed between the positive and negative - terminals of a battery electricity flows. Alternating current AC AC voltage rises above zero positive and then falls below zero negative. AC voltage changes direction very rapidly. The most common example of AC voltage is the wall outlet in a home or business. In North America these outlets provide approximately 120 volts of AC directly to any electrical appliance that is plugged in. Examples of appliances are a computer 1 - 3 CCNA 1 Networking Basics v - Lab Copyright 2003 Cisco Systems Inc. toaster or television. Some devices such as small printers and laptop computers have a a small black box called a transformer that plugs into a 120V AC wall outlet. The transformer converts the AC voltage to DC voltage for use by the device. Some AC outlets can provide a higher voltage of 220V for use by devices and equipment with heavier requirements such as clothes dryers and arc welders. Prior to starting .

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