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1. GOVINDRAO WANJARI COLLEGE OF ENGINEERING ,
POLYTECHNIC AND TECHNOLOGY, NAGPUR
148, 149 Salai Godhni, Near Chikna Village,
Hudkeshwar Road, Tal. Dist. Nagpur – 441204
(Maharashtra).
DEPARTMENT OF ELECTRICAL ENGINEERING
OHM‘S LAW
ELECRICAL CIRCUIT
2ND YEAR 3RD SEM.

2. OHM’S LA
W

3. WHAT IS OHM’S LAW ?
• OHM’S LAW IS A FORMULA USED TO CALCULATE THE RELATIONSHIPBETWEENVOLTAGE,
CURRENTAND RESISTANCEIN AN ELECTRICAL CIRCUIT.
• STATEMENT:- OHM’S LAW STATESTHAT THE CURRENT THROUGHA CONDUCTOR BETWEEN
TWO POINTS IS DIRECTLY PROPORTIONALTO THE VOLTAGE ACROSS THE TWO POINTS.
THEREFORE,V = RI WHERE RIS A CONSTANT CALLED RESISTANCE.R DEPENDSON THE
DIMENSIONSOF THECONDUCTOR AND ALSO ON THE MATERIAL OF THE CONDUCTOR. ITS SI
UNIT IS OHM.

4. CIRCUIT DIAGRAM

5. MATHEMATIC EXPRESSION
• OHMS LAW—“AT CCURRENTTEMPERATURECURRENTIS DIRECTLYPROPORTIONALTO ITS
POTENTIALDIFFERENCE.”
• MATHEMATICALEXPRESSIONON CAN BEGIVEN AS…
1. V = IRWHEREV REPRESENTSPOTENTIALDIFFERENCE;
2. I REPRESENTSCURRENT.
3
. R= RESISTANCECONSTANT.

6. MY
MOLTØ
GE
O OESFIS

7. TWO TYPES OF CIRCUIT CONNECTIONS.
• SERIESCONNECTION
• PARALLELCONNECTION

8. KIRCHOFFS CURRENT LAW (KCL)
• “THEALGEBRAICSUM OFALL CURRENTSENTERINGAND EXITING A NODE MUSTEQUALZERO.”
∑ I = 0

9. KIRCHOFFS VOLTAGE LAW (KVL)
• THEALGEBRAICSUMOF ALL VOLTAGE DIFFERENCESAROUNDANY CLOSED LOOPIS ZERO.
∑V = 0

10. THANK
YOU
✨