Electric Currents & Circuits AP – Ch 20 & 21. Intro Stuff Circuit? – Power Supply – Resistance.

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Presentation transcript:

Electric Currents & Circuits AP – Ch 20 & 21

Intro Stuff Circuit? – Power Supply – Resistance

Battery? A thing that produces a potential difference through a chemical reaction. – battery, electric, device that converts chemical energy into electrical energy. (How Stuff Works. Com) The act of beating or pounding. – Law. The unlawful and unwanted touching or striking of one person by another, with the intention of bringing about a harmful or offensive contact. (Wiki-Idiot-Pedia.comedy)

Intro Stuff Electromotive Force – emf Maximum V of battery Current – Flow of charge

Intro Stuff

Ohm ’ s Law – States linear relationship between V & R

Intro Stuff Resistance – Says what it means e - has to ‘ fight ’ thru a wire or ‘ resistor ’

CONVENTIONAL Current ELECTRON Current

CONVENTIONAL Current ELECTRON Current

Intro Stuff Power – Same as regular P, but different

Intro Stuff Power …

Intro Stuff Wiring Circuits – Series / Parallel Parallel

WHY? C //

WHY? C Series

Quantitative Summary

Coulomb’s Law: Force between any 2 charges

Electric Field Strength: Force on test Q

Electric Potential Energy: Fd

Electric Field (av): Potential at a distance

Electric POTENTIAL: NOT a vector…

Capacitance: Property of Capacitors

Capacitance: Property of Capacitors

Energy stored in Capacitor:

Definition of Electrical Current: SI Unit - Amps

Definition of Electrical Current: SI Unit – Amps (A)

Resistance in a WIRE: SI Unit – Ohms (  )

OHM’S LAW: All Circuits Must Obey…

OHM’S LAW: All Circuits Must Obey… 12V 6666

Electrical Power: From P=W/t

Series Circuits

Parallel Circuits

Circuits w/Capacitors

EXAMPLE #1 Three 12  resistors are used in two circuits; one in series and one in parallel. What is the R equivalent of each circuit?

Series 12 

Parallel 12 

Series + Parallel 12  66 18 