Electric Vehicle Charging Station Installation & Operational Management

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Basic Symbols

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  Symbol Description Image Resistor (R) Represents a resistor used to limit current flow. Capacitor (C) Denotes a capacitor used to store electrical energy. Inductor (L) Represents an inductor, which stores energy in a magnetic field. Battery (DC Voltage Source) Symbolizes a direct current (DC) voltage source, typically a battery. Ground Indicates an electrical connection to the earth or ground. Switch SPST: Denotes a single-pole, single-throw switch that can open or close a circuit. SPDT: Denotes a single-pole, double-throw switch that can open or close a circuit. Fuse Represents a fuse, a safety device that interrupts excessive current flow. Relay Symbolizes an electromagnetic relay used for switching high currents. Diode Represents a diode, allowing current t...
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What is Power Factor? Causes, Effects, and Methods of Improvement

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  Introduction Welcome, future engineers! If you have ever looked at an electricity bill from an industrial unit or read the nameplate of a large motor, you have probably come across the term "Power Factor." It’s a crucial concept in electrical engineering that bridges your theory exams and real-world industrial practice. Understanding it not only helps you score marks but also saves lakhs of rupees in electricity costs. Let’s demystify this important topic together. What is Power Factor? Definition In the simplest terms,  Power Factor (PF)  is a measure of how effectively electrical power is being used. Think of it like this: When you buy a glass of cold drink, you pay for the full glass (what you get). But what if it’s half-filled with foam? You paid for the full volume, but you only get half the actual drink. Similarly, in an AC circuit, not all the power supplied by the electricity board (called Apparent Power) is converted into useful work (called Real Power)...
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Basic Electrical Engineering Questions

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Interview Q&A/ Technical Round: Short Q&A Section: Q1. What is Electrical Resistance? Resistance is the property of a material that opposes the flow of electric current. It depends on the material, length, cross-sectional area, and temperature of the conductor. Its unit is ohm (Ω). Q2. State Ohm’s Law. Ohm’s Law states that the current flowing through a conductor is directly proportional to the applied voltage, provided temperature remains constant. Mathematically, V = IR. Q3. What is Electric Current? Electric current is the rate of flow of electric charge in a conductor. It is measured in amperes (A) and is denoted by I. Q4. Define Electrical Power. Electrical power is the rate at which electrical energy is consumed or converted into another form. It is measured in watts (W) and given by P = VI. Q5. What is Electrical Energy? Electrical energy is the total work done by an electrical source over time. It is measured in  watt-hour (Wh) or kilowatt-hour (kWh). Q6. What ...
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