Computer Mouse: History, Types, and Connectivity
The Computer Mouse: A Historical Overview
Early Designs
The first computer mouse, patented as the “XY Position Indicator for a Display System,” was constructed from wood. Its cobblestone-like design featured two metal wheels for controlling cursor movement on two axes (vertical and horizontal) and a red button on top. Despite its archaic appearance, the fundamental operating principles remain the same today.
Mechanical Mice
Mechanical mice utilize a large plastic or rubber multi-layered base. Two
Pressure and Temperature Measurement Instruments
Pressure Gauges
A gauge is an instrument used for measuring fluid pressure, typically the difference between fluid pressure and local mechanical pressure. Pressure is defined as the force per unit area exerted by a liquid or gas perpendicular to a surface.
U-Tube Manometer
 | Pressure gauges are instruments designed to measure pressure. A traditional method for accurate pressure measurement involves a U-shaped glass tube containing a liquid of known density. Mercury is commonly used for high-pressure |
Industrial Automation: Control, Switching, and Protection Devices
Automatism is a system that controls a single machine or production process, reducing human intervention. Commonly used devices include sectioning, switching, and protection devices.
Sectioning Devices: These isolate a part of the network electrically for maintenance. Examples include disconnectors, switches, and circuit breakers or contactors.
Switching Devices: These establish or interrupt the power supply to receptors automatically or remotely. Examples include electromagnetic contactors, relays,
Read MoreAnalog and Digital Television Transmission Systems
Analog Television Process
- Capture
- Registration
- Production
- Transportation (Tx)
- Reception (Rx)
Digital Television Process
- Recording
- Production
- Transportation (Tx)
- Reception (Rx)
Digital Transmission Mediums
- Satellite
- Cable
- Web
- Terrestrial Transmission
Advantages of Digital Transmission
- Efficient Bandwidth Administration
- Increased Noise Immunity (Tx)
- Component Video Transmission
- Increased Horizontal Resolution (Double Resolution)
- Progressive Scan Capability
- Increased Vertical Color Resolution
- HDTV Possibility
- Data and Other
Electric Motor Fundamentals
Electric Motors
Motor Classification by Current Type
Electric motors are categorized based on the type of current they use:
- DC motors
- AC motors
- Universal motors (compatible with both AC and DC)
DC Motor Classification by Excitation
DC motors are further classified by their excitation method:
- Independent excitation
- Series excitation
- Shunt excitation
- Compound excitation
- Permanent magnet excitation
AC Motor Classification
AC motors are classified based on several factors:
- Speed: Synchronous or asynchronous
- Rotor type:
Computer Networks: A Deep Dive
1. Company Network Needs
- Marketing: Negative impact.
- Banking: Control finances remotely. Positive impact.
- Competition Monitoring: Positive impact.
- Framework Expansion: Positive impact.
- Communication: Sending and receiving requests. Positive impact.
- Social Interaction: Reduced face-to-face contact. Negative impact.
- Productivity and Costs: Increased productivity and cost savings. Positive impact.
- Network Printing: Shared printing resources. Positive impact.
- Network Setup: Requires a well-maintained network.