# Overview of the course

we will be using few of these concepts in this course ,it will get better as time goes on.

**1.Review of Circuit Elements**

**2.Review of Ohms law**

**3.Review of Resistivity**

**4.Review of kirchhoff’s laws**

**5.Applying the knowledge gain**

**2.Review of Ohms law**

ohms law states that the current flowing through a metallic conductor is directly proportional to the potential difference across that conductor provided the temperature remains constant. What is potential difference? It is the voltage difference between any two points in a circuit

mathematically ohms law is written as

**V=IR**

where **V**=Potential difference ;** I**=current **R**=resistance

**3.Review of Resistivity**

**Resistivity** is a measure of the **resistance** of a given size of a specific material to electrical conduction. … Materials that conduct electrical current easily are **called** conductors and have a low **resistivity**. It is a measure of how much a material stops the flow of electric current through it.

mathematically written as

**ρ = RA/L**

where **ρ=**Resistivity** ; R=**resistance **A=**cross-sectional area of material ;** L=**Lenght of the conductor

**4.Review of Kirchhoff’s laws**

4.a)Kirchhoff’s Voltage Law states states that in a closed loop of an electrical network the algebraic sum of potential difference is directly proportional to the algebraic sum electromotive forces.

**ΣV=ΣEMF’s**

4.b)Kirchhoff’s Current Law states that at the junction of an electrical network the algebraic sum of current entering is equal to the algebraic sum of current leaving the junction.

CURRENTS IN( **I1+I2**+**I3)**

CURRENTS OUT **(I4+I5)**

Ohms law says currents in =currents out

**I1+I2**+**I3=I4+I5**

**DON’T GIVE UP YET THERE IS MO****RE TO**** COME!!!**