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Midterm

# PY 212 Midterm: PY 212 Test 2 Material Summary

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School
North Carolina State University
Department
Physics
Course
PY 212
Professor
Heyward
Semester
Spring

Description
Chapter 20 Current:β’ Positivecharge flow, outof positivebatteryterminal. βπ β’ I = βπ‘ β’ I = πππ£ π΄ π πΏ Resistance: β’ π = π π΄ β’π = π 1 + πΌ Ξπ‘ π = π 1 + πΌ Ξπ‘ 0 0 Ohmβs Law: ΞV = IR Power: β’ .P = ΞπΈ Ξπ‘ 2 Ξπ 2 β’ P = IΞπ = πΌ R = For ohmic materials π β’ %Efficiency = ππ’π πππ’π π π‘ππ‘ππ β’ Poweris conserved β’ Energy Costs AC Circuits:β’ V = V π ππ 2πππ‘ I = I π ππ 2πππ‘ 0 0 1 1 1 β’ Pavg = 2P0 Vrms = V0 Irms = I0 2 2 β’ Use DC equations(Ohmβs Law and Power),but be consistentwith subscripts. Circuit Protectiβ’ Protectivedevices: Fuses; Circuit Breakers β’ Types of faults: Short Circuit; Overload;Ground Fault Chapter 21 Series and Parallel:β’ Properties and behavior of series and parallel circuits. β’ π π πππππ  π 1 π +2π + 3 1 1 1 1 β’ π = π + π + π + β― ππππππππ 1 2 3 Solve a circuit by simplification Power Supplies: β’ For currentout of the positive terminal: ππ = β° β πΌπ1 π ππ= π β° π π β’ For currentinto the positive terminalΞπ ππ= β° + πΌπ1 π ππ= π β° π π β’ Combining emfβs in series Kirchhoffβs Rules: β’ JunctionRule (AKA Current Rule) β’ LoopRule (AKA VoltageRule) Meters: β’ Voltmetershave a very large resistance β’ Voltmetersare connectedin parallel β’ Ammetershave a very small resis
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