Electrical Circuits: Types, Laws, and Analysis Methods
Item 55: Electrical Circuits
Introduction
A circuit or an electrical network is an interconnection of electrical elements tied together in a closed path so that an electrical current can flow. These electrical elements are resistors, inductors, capacitors, voltage sources, and current sources. All these elements are characterized by two terminals and a known current-voltage relationship between the terminals.
Resistance strictly adheres to Ohm’s law: V = R ยท I
In the inductor or coil, there is a voltage
Read MoreFisheries Management: Effort, Selectivity, and Regulation
Fishing Effort
Fishing effort is the activity performed in a fishery, determined by the fishing power of each vessel and the time spent fishing. Total effort is the sum of fishing effort across all vessels and their respective fishing times.
Total fishing effort depends on: number of boats, individual boat effort, fishing power, and fishing time.
To optimize fishing, any of these variables can be adjusted. Gear selectivity separates the population into groups. Selectivity influences the catch composition.
Read MoreTransformer Components and Their Functions
Windings
Primary and secondary windings are electrical conductors neatly coiled around an iron core. The primary winding connects to a power source, while the secondary winding connects to the load, receiving energy induced from the primary winding.
The transformation ratio depends solely on the number of turns in the primary coil (N1) and the secondary coil (N2).
Core
The core plays a crucial role by channeling the magnetic flux from the primary winding to the secondary winding.
It consists of rolled
Read MorePolyphase AC Motors: Synchronous and Induction
Polyphase AC Motors
Two basic types are designed to operate polyphase AC motors: synchronous motors and induction motors.
Synchronous Motors
The synchronous motor is essentially a three-phase alternator that works in reverse. The field magnets are mounted on a rotor and are excited by direct current. The armature coils are divided into three parts with three-phase alternating current. The variation of the three waves of current in the armature reaction causes a variable magnetic field, making the field
Read MoreTransformers: Types, Applications, and Measurement Techniques
Why are the grounded side of the transformers?
A: It gets to the secondary grounding that will preclude any dangerous situation in case of a discharge from primary to secondary.
Why not be shorted transformer secondary Measurement of tension?
A: Because currents circulate very intense that may damage the transformer. So when disassembling the measuring instrument should not be shorting the secondary of voltage transformer unit.
What is used transformers?
A: For that high-voltage networks isolate the
Read MoreUninterruptible Power Supply (UPS) Systems
Uninterruptible Power Supply (UPS)
What is a UPS?
A UPS provides emergency power to connected devices during a power outage. It also improves power quality, protecting against surges, spikes, and other electrical disturbances. UPS systems are crucial for “critical load” equipment, such as medical devices and industrial machinery, preventing data loss and equipment damage due to power failures.
Network Problems
- Blackout: Complete loss of power due to events like lightning strikes or excessive demand.