1. Holt: Physics Ch. 20 – 1 Pages 730-735
Electrical Circuits
Holt: Physics Ch. 20 – 1
Pages

2. Electrical Circuits Schematic diagrams – Graphical
representations of an electrical circuit.

3. Electrical Circuits
Standard symbols used to represent components. (Page 730)

4. Electrical Circuits
Electrical circuits - Set of electrical components connected to provide one or more complete paths for movement of charge.

5. Electrical Circuits
Short circuit – a circuit which contains little or no resistance
 Produces heat, can cause fires
Examples:
- 2 terminals of a battery directly connected
- Uninsulated wires come into contact
 Dangerous

6. Electrical Circuits Load – any element or group of elements in
a circuit that dissipates energy
EMF – Electromotive force → the energy per unit charge supplied by a source of electric current
→ A source of electrical energy
→ A “charge pump”
→ Examples are batteries and generators

7. Electrical Circuits
*There is some internal resistance in a battery which lowers the voltage available to be used
Energy is constantly converted
1. Chemical potential energy is converted to
electrical potential energy
2. Electrical potential energy is changed to
thermal energy, light, mechanical energy

8. Electrical Circuits Homework: 1. Read Chapter 20 section 1
2. Page 735 #1-5
3. Read Chapter 20 section 2: Resistors in
series (Pages )