Chapter Nine : The Electric Current and Ohm's Law

Basic concepts

1- The current intensity: " I "
* The quantity of chargflowing through a given section in circuit per second. ( I = Q / t )
* It is measured in " Amperes " or C/s .

2- The potential difference : " V "
* Is the work done to transfer unit charge between two points. ( V = W / Q )
* It is measured in " Volts " or J/C .

3- Ohm's law :
* The current produced in a given conductor - kept at constant temperature - is directly proportional to the potential difference across its terminals. i.e
Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0011

Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0011

4- Ohm's law for a closed circuit :
Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0012

mp
Where V_B is the e.m.f of the source r is its internal resistance and R is the external resistane.

5- Parameters affecting the resistance:
Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0013

Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0013

Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0014

Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0015

8- Resistors in series:
Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0016

9- Resistors in parallel:
Chapter Nine : The Electric Current and Ohm's Law BR-PHE12-0017

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