Download Electrical Circuits

Electrical Circuits
Holt: Physics Ch. 20 – 1
Pages 730-735
Electrical Circuits
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Schematic diagrams – Graphical
representations of an electrical circuit.
Electrical Circuits
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Standard symbols used to represent
components. (Page 730)
Electrical Circuits
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Electrical circuits - Set of electrical
components connected to provide one or
more complete paths for movement of
charge.
Electrical Circuits
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Short circuit – a circuit which contains little or
no resistance
 Produces heat, can cause fires
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Examples:
- 2 terminals of a battery directly connected
- Uninsulated wires come into contact
 Dangerous
Electrical Circuits
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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
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
Electrical Circuits
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Homework:
1. Read Chapter 20 section 1
2. Page 735 #1-5
3. Read Chapter 20 section 2: Resistors in
series (Pages 736-740)