**AC Fundamentals Library**

- What is Main Difference b/w Electrical and Electronics Engineering? (Very Simple)
- What are the fundamental differences between E.M.F (Electro motive force) and P.d (Potential difference)?
- How to Calculate/Find the Rating of Transformer in kVA (Single Phase and Three Phase)?
- Why Transformer Rating In kVA, Not in KW?
- All about Power Factor, Disadvantages and improvement
- Why we can’t store AC in Batteries instead of DC?
- How to find The value of Burnt Resistor ( By three handy Methods )
- Power Formulas in DC, AC Single Phase and AC Three Phase Circuits
- Capacitors(MCQs with Explanatory Answers)
- How to Calculate/Find the value of Ceramic / Non-Polarized Capacitors?
- Prove that Volume of The conductor is Inversely proportional to the squire of Voltage ( Vol = 1/V
^{2})and what is the effect of this relation on Transmission and Distribution System. - Why Power is Zero (0), in Pure Inductive, Pure Capacitive or a circuit in which Current and Voltage are 90 Degree out of phase?
- Basic Concepts (MCQs with Explanatory Answers)
- A (50/60 Hz) Transformer. Which one will give more Output? (When operates on 50 or 60 Hz frequency
- Ohm’s Law with simple explanation
- Why the circuit Current (I) decrease, when Inductance (L) or inductive reactance(XL) increases in inductive circuit?
- Single Phase AC Circuits. MCQs ( With Explanatory Answers)
- In inductive circuit, Why Current increases, when frequency Decreases?
- Three Phase AC Circuits (MCQs With Explanatory Answers)
- According to Ohm’s Law, Current increases, when Voltage increases,(I=V/R), But Current decreases, when Voltage increases according to (P=VI). Explain?
- Why the reactance of a system under fault condition is low and faults currents may raise dangerously high value? (With simple example)
- Basic Electrical Formulas
- Advantages of Power factor improvement and Correction
- Electrical Formulas AC & DC Circuits (Single-φ & 3-φ)
- Our homes are supplied with sinusoidal voltage whose equation should be (v=Vm Sin φ). But we always say that A.C. voltage at home is 230 V. how do you explain this difference?
- Why XL (Inductive Reactance) In DC Supply Is Zero (0)?
- Why the Circuit Power factor (Cos θ) Decreases, when Inductance (L) or inductive reactance (XL) increases, in inductive circuit?
- How to determine the number of Nodes, Branches, Loops and Meshes in a Circuit?
- Electric circuits / Networks and important terms related to it you must know

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Dear sir,<br /><br />How to select system of voltage (12V, 24V for DC) and 11KV, 22KV, 33KV voltage system with respect to load requirement.