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ELECTRICAL TECHNOLOGY
Electricity is not a fun but easy to learn.
Prepared by,Mr. Vijay Balu Raskar
CHAPTER NUMBER NAME OF CHAPTER
1 D.C. CIRCUITS2 A.C. FUNDAMENTALS
3 SINGLE PHASE AC CIRCUITS
4 THREE PHASE AC CIRCUITS
5 SINGLE PHASE TRANSFORMERS
6 D.C.MOTORS
7 FRACTIONAL HORSE POWER MOTORS
8 INSTALLATIONS,EARTHING AND TROUBLE SHOOTING
9 DIFFERENT TYPES OF MOTORS
1. D.C. CIRCUITS•ELECTRIC CURRENT= ?• 1e = 6.24 X 10^18 ELECTRONS
•VOLTAGE = ?•RESISTANCE = ?•DC ? & AC ?
OHM’S LAW• Ohm's law states that the current through a
conductor between two points is directly proportional to the potential difference across the two points.
• Resistance is constant.
• V=IR
PROBLEMQ.1 V = 10 Volt, I = 5 Ampere & R = ?
Q.2 R = 3.5 Ohm, I = 0.2 Ampere and V = ?
H.W.V = 12Volt, R = 7Ohm & I = ?
FACTORS GOVERNING THE RESISTANCE
• 1) Type and Nature of Material: Iron offers high resistance.
• Copper / Silver is the best conductor.• Hardness increase the resistance due to heat
treatment.• 2) Length of the conductor: R directly proportional to
L• 3) Cross-sectional Area: Inversely proportional to
Resistance• 4) Temperature: Directly proportional
SERIES RESISTANCE
PARALLEL RESISTANCE
OPEN & SHORT CIRCUIT
PROBLEM• Q.1 Calculate the equivalent of series
resistance or total resistance?• ANS: Addition of the number.
• Q.2 Calculate the equivalent of parallel resistance or total resistance?
• ANS: Inversely addition and Inverse of answer.
KIRCHHOFF’S LAW
1)KCL2)KVL
PROBLEMS•1) Based on KCL•2) Based on KVL
ELECTRICAL NETWORKbased on R, L and C parameters.1.Linear Circuits- R, L & C = Constant with V & I.2.Non-linear Circuits- Vary with V & I3.Bilateral Circuits- V & I in same direction of operation like X’mission.4.Unilateral Circuits- V & I depends on direction of operation eg Vaccum Diode. 5.Active Network- Having Source 6.Passive Network- Without a Source