Answer:
Definition of Terms
Ampere - basic unit of current
Current - the flow of electrons moving in a given direction Electronic measuring instrument - portable instruments used to measure
electrical quantities such as current, voltage, and resistance
Ohmmeter - an electronic instrument used to measure resistance of a component or the entire circuit
Ohmmeter scale - section of the ohmmeter where the value of the resistance is being indicated
Range multiplier - a portion in the ohmmeter where the actual reading is multiplied by the range value
Resistance - the opposition to the flow of electrons
Resistor - an electronic component that is used to offer opposition to current in an electrical circuit
Resistor color coding - a scheme to determine the value of resistors by color bands printed on their bodies as code
Test Probes - connectors connected to terminals of the VOM and component’s terminals or test points in a circuit to be tested. They are oftentimes red and black in color
Tolerance - the fourth color in the 3-band color coding that indicates the percentage of deviation from its color coded value
Volt - basic unit of voltage
Voltage - an electrical pressure that pushes current to flow within a load through a conductor
Zero-ohm adjuster - part of the ohmmeter that is used in adjusting the pointer of the ohmmeter to zero before resistance measurements or continuity tests are made.
Parts of an Ohmmeter
1. Pointer. It is the most important part of the ohmmeter. It indicates the value of electrical quantity that has been measured.
2. Ohmmeter Scale- Nonlinear scale where reading of the resistance is based. It is usually found in the uppermost part of the VOM.
Range Multiplier- The portion of the ohmmeter where the actual reading is being multiplied.
Zero Ohm Adjustment – It is the portion of the ohmmeter where it is adjusted when the pointer of the ohmmeter fails to point to zero.
Test Probe- Serves as the input portion of the ohmmeter. Red test probe becomes positive in some instances, while the black one is negative.
