Electrical measurements - Introduction

INTRODUCTION:
Electrical measurement often come down to either measuring current or measuring voltage. Even if you are measuring, you will be measuring the frequency of a current signal or a voltage signal and you will need to know how to measure either voltage or current. In this short lesson, we will examine those two measurements – starting with measuring voltage. However, first we should note a few common characteristics of the meters you use for those measurements.

Many times you will use a digital multimeter to measure either voltage or current. Actually, a DMM (digital multimeter) will also usually measure frequency and resistance. You should note the following about typical DMMs.

-       Polarity is important.

-       Often one of the terminals on the DMM may be co0nnected to the ground.