1. Plan What is a resistor? What is a resistor?resistor How can we measure the resistance? How can we measure the resistance?resistance Ohm s Law. Ohm s Law.Law Types of resistors. Types of resistors.resistors Parallel connection. Parallel connection.connection Series connection. Series connection.connection

2. Resistors George Simon Ohm George Simon Ohm

3. What is a resistor? resistor Opposes the path of electrical current. Opposes the path of electrical current. Produce heat energy. Produce heat energy.

4. Ohmmeter is an instrument used to measure resistance. to

5. Ohm s Law: Law Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. Ohm's law applies to electrical circuits; it states that the current through a conductor between two points is directly proportional to the potential difference or voltage across the two points, and inversely proportional to the resistance between them. The mathematical equation that describes this relationship is: V=R.I The mathematical equation that describes this relationship is: V=R.I

6. Types of resistors resistors

7. Grouping of resistors: Parallel grouping. Parallel grouping. Series grouping. Series grouping.

8. Parallel Parallel Grouping: Parallel 1/Req = 1/ R1 + 1/R2 + 1/R3 + 1/R4 + ….

9. Series Series Connection: Series Req = R1 + R2 + R3 + R4 + ….

10. Our body resistance If dry about 5ooooᾩ. If dry about 5ooooᾩ. It is dangre to exposd to direct elctric current It is dangre to exposd to direct elctric current