Electric Currents & Circuits AP – Ch 20 & 21. Teaching LAB YOU teach – Simple Circuit – Series Circuit – Parallel Circuit – Combo Circuit – Kirchoff’s.

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Presentation transcript:

Electric Currents & Circuits AP – Ch 20 & 21

Teaching LAB YOU teach – Simple Circuit – Series Circuit – Parallel Circuit – Combo Circuit – Kirchoff’s Laws

Ch 20 & 21 Outline 1 st Half of PPTX – New stuff from OpenStax text 2 nd Half – My old stuff

Current

Figure 20.2 The rate of flow of charge is current. An ampere is the flow of one coulomb through an area in one second.

Note Direction of I…

Conventional Current Physical Current

Ohm’s Law

Started as two proportions – I through a RESISTOR  V drop – I through a RESISTOR  1/R of resistor Put together:

Ohmic Material Any material where R is independent of I and V – Most metals & common conductors

Resistivity

Electrical Power

Intro Stuff Power – Same as regular P, but different

Intro Stuff Power …

Sect 20.6: Hume Bean Hazards

Ch 21: Circuits

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 ’

Intro Stuff Resistance – Radio Shack SCAM!

Intro Stuff Resistance – Radio Shack SCAM!

CONVENTIONAL Current ELECTRON Current

CONVENTIONAL Current ELECTRON Current

Intro Stuff Wiring Circuits – Series / Parallel Parallel

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…

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

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 

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