Programmable Logic Controller (PLC) Components

Programmable Logic Controller (PLC) Components

All Programmable Logic Controllers (PLCs) have four basic components. The four basic components of a Programmable Logic Controller include the power supply, input/output (I/O) section, processor section, and programming section. See Figure 1. Figure 1. The four basic parts of a controller include the power supply, I/O section, processor section, …

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How to Network Printer Sharing

How to Network Printer Sharing

This lesson will provide an introduction on How to implement Network Printing. Examples of how to share printers and connect to shared printers are described. Networking Printing Sharing printers is a huge savings of money and resources for businesses and home users alike. There are three common ways to share …

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Virtualization Basics

This lesson will provide an introduction to virtualization on the desktop or server. Topics such as the purpose of virtualization, what a Hypervisor is and how it is used, software that can allow virtualization, and hardware requirements are outlined. Purpose of Virtualization Virtualization is a new topic on the A+ …

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Types of Buses in Computer Architecture

Types of Buses in Computer Architecture

Every bus has three distinct channels of communication. The address bus, which is a unidirectional pathway that allows information to travel in only one direction, carries information about where data will be stored in memory. The data bus is a bidirectional pathway that carries the actual data (information) to and …

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Motherboard Components

Motherboard | Components | Function | Diagram

The motherboard is the main system board for the computer and connects all of the internal hardware components. This lesson will take a look at various components which are built into the motherboard. This lesson will also look at the expansion slots used to add hardware components to a system. …

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Computer Maintenance and Security

Computer Maintenance and Security

Preventive maintenance is a large part of a desktop administrator’s responsibility. This lesson introduces several procedures that help to keep a computer running properly and reduce downtime. Securing a computer can also be considered preventive maintenance in that it helps to prevent malicious attacks against a computer that could render …

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Computer Form Factors, Cases, and Power Supplies

Computer Form Factors, Cases, and Power Supplies

A computer technician must be able to differentiate among the various form factors available versus the type of case being used. The computer case holds all of the system components starting with the motherboard (or system board) and power supply. All three must use the same form factor. Computer form …

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Windows Networking Basics

Windows Networking Basics

Networking is important in today’s world to everyone in business and at home. This lesson explains how a user configures their desktop to connect to other computers on a home network, a business network or the Internet. Windows Networking Before a computer can connect to any network, its Network Interface …

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RC and RL High Pass Filter

RC and RL High Pass Filters

As you know, a high pass filter is one that is designed to pass all frequencies above its cutoff frequency. High pass filters are formed by reversing the positions of the resistive and reactive components in the RC and RL low pass filters. In this section, we will discuss the …

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RC and RL Low Pass Filter

RC and RL Low Pass Filters

Simple RC and RL circuits can be used as low pass and high pass filters. In this section, we will look at RC and RL low pass filters. RC Low Pass Filters An RC circuit acts as a low pass filter when constructed as shown in Figure 1. In the …

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What is Frequency Response | Basics

What is Frequency Response | Basics

The reaction of a circuit has to change in frequency is referred to as its Frequency Response. For example, consider the parallel RLC circuit shown in Figure 1. If the operating frequency of the circuit increases, Here’s what happens: • The reactance of the inductor increases because of XL=2πfL. The …

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AC Waveform & AC Circuit Theory

AC Waveform & AC Circuit Theory

Generally, the term Alternating Current (AC) is used to describe any current that periodically changes direction. For example, take a look at the circuit current time relationship as shown in Figure 1. The horizontal axis of the graph is used to represent time (t). The vertical axis of the graph …

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Residential Electrical Circuit

Residential Electrical Circuit

In this article, we will look at how residential service entrances, switches, and receptacles are connected to form the basic residential electrical circuit. Conductor Most residential electrical circuits utilize one of the conductor combinations identified in Table 1. The conductor combinations listed are illustrated in Figure 1. Table 1: Conductor …

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Service Entrance and Service Drop

Service Entrance and Service Drop

Power enters the drop through the Service Entrance. The service entrance includes the Electric Meter that measures the amount of energy delivered to the home and the Service Panel that houses the circuit breakers or fuses. The service panel also distributes power to the various circuits in the house. Service …

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