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PY 212 Midterm: PY 212 Test 2 Material Summary

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North Carolina State University
PY 212

Chapter 20 Current:β€’ Positivecharge flow, outof positivebatteryterminal. βˆ†π‘„ β€’ I = βˆ†π‘‘ β€’ I = π‘›π‘žπ‘£ 𝐴 𝑑 𝐿 Resistance: β€’ 𝑅 = 𝜌 𝐴 β€’πœŒ = 𝜌 1 + 𝛼 Δ𝑑 𝑅 = 𝑅 1 + 𝛼 Δ𝑑 0 0 Ohm’s Law: Ξ”V = IR Power: β€’ .P = Δ𝐸 Δ𝑑 2 Δ𝑉 2 β€’ P = IΔ𝑉 = 𝐼 R = For ohmic materials 𝑅 β€’ %Efficiency = 𝑃𝑒𝑠𝑒𝑓𝑒𝑙 𝑃 π‘‘π‘œπ‘‘π‘Žπ‘™ β€’ Poweris conserved β€’ Energy Costs AC Circuits:β€’ V = V 𝑠𝑖𝑛 2πœ‹π‘“π‘‘ I = I 𝑠𝑖𝑛 2πœ‹π‘“π‘‘ 0 0 1 1 1 β€’ Pavg = 2P0 Vrms = V0 Irms = I0 2 2 β€’ Use DC equations(Ohm’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€’ 𝑅 π‘ π‘’π‘Ÿπ‘–π‘’π‘  𝑅 1 𝑅 +2𝑅 + 3 1 1 1 1 β€’ 𝑅 = 𝑅 + 𝑅 + 𝑅 + β‹― π‘π‘Žπ‘Ÿπ‘Žπ‘™π‘™π‘’π‘™ 1 2 3 Solve a circuit by simplification Power Supplies: β€’ For currentout of the positive terminal: 𝑃𝑆 = β„° βˆ’ πΌπ‘Ÿ1 𝑃 𝑃𝑆= 𝑃 β„° 𝑃 π‘Ÿ β€’ For currentinto the positive terminalΔ𝑉 𝑃𝑆= β„° + πΌπ‘Ÿ1 𝑃 𝑃𝑆= 𝑃 β„° 𝑃 π‘Ÿ β€’ Combining emf’s in series Kirchhoff’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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