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