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# D.c.circuits

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### D.c.circuits

1. 1. ELECTRICAL TECHNOLOGYElectricity is not a fun but easy to learn.
2. 2. Prepared by, Mr. Vijay Balu RaskarCHAPTER NUMBER NAME OF CHAPTER1 D.C. CIRCUITS2 A.C. FUNDAMENTALS3 SINGLE PHASE AC CIRCUITS4 THREE PHASE AC CIRCUITS5 SINGLE PHASE TRANSFORMERS6 D.C.MOTORS7 FRACTIONAL HORSE POWER MOTORS8 INSTALLATIONS,EARTHING AND TROUBLE SHOOTING9 DIFFERENT TYPES OF MOTORS
3. 3. 1. D.C. CIRCUITS• ELECTRIC CURRENT= ?• 1e = 6.24 X 10^18 ELECTRONS• VOLTAGE = ?• RESISTANCE = ?• DC ? & AC ?
4. 4. OHM’S LAW• Ohms 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
5. 5. 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 = ?
6. 6. 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
7. 7. SERIES RESISTANCE
8. 8. PARALLEL RESISTANCE
9. 9. OPEN & SHORT CIRCUIT
10. 10. 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.
11. 11. KIRCHHOFF’S LAW1)KCL2)KVL
12. 12. PROBLEMS•1) Based on KCL•2) Based on KVL
13. 13. ELECTRICAL NETWORKbased on R, L and C parameters.1.Linear Circuits- R, L & C = Constant withV & I.2.Non-linear Circuits- Vary with V & I3.Bilateral Circuits- V & I in same directionof operation like X’mission.4.Unilateral Circuits- V & I depends ondirection of operation eg Vaccum Diode.5.Active Network- Having Source6.Passive Network- Without a Source