1. Chapter 1-1 SI Units Voltage and Current basic circuit elements
passive sign convention.

2. What this course is about
Finding unknown Voltages and Currents
Finding energy delivered or used
Finding component values/configurations to create desired voltages and currents
Learn fundamental definitions, rules and techniques
Practice, practice…..and more practice

3. Problem Solving Approach
Identify what’s given and what’s to be found
Sketch a circuit diagram and/or modify existing diagram
Decide on method or approach
Solve it (may need to go back)
Check to see if solution make sense!!!!!!

4. SI Units

7. Electric Voltage

8. When we discuss or measure an electrical voltage we are looking at the potential difference between two points

9. Electric Current

10. When we discuss or measure an electrical current we are looking at the charge flow through an element

11. Ideal Basic Circuit Element
Has only two terminals
Can be described mathematically in terms of current and/or voltage.
Cannot be subdivided into other elements.

12. For circuit analysis we must assign a reference polarity for voltage and reference direction for current
We will adopt the passive sign convention for this class
Passive Sign convention: Whenever the reference direction for the current in an element is in the direction of the reference voltage drop across the element, use a positive sign in expressions relating the voltage to the current. Otherwise use a negative

13. Examples of passive sign convention

14. Examples of passive sign convention (Resistor)

15. SI Units related to Electrical Circuits
What you should know
SI Units related to Electrical Circuits
Definitions Voltage and Current
Definition of basic circuit element
Be able to apply the passive sign convention
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