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Download ap physics b lesson 72 kirchoff`s laws
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Transcript
• You will need your notes and calculator today • Turn in the HW (75pts) • Blizzard Bag 2 is due this Friday. Kirchoff’s Laws Voltage and Current Kirchoff’s Loop (current) Law • Kirchoff’s Current Law – The same amount of charge must enter a junction in a given time interval as the amount of charge that leave the junction in the same time interval. – Itotal = I1 + I2 + I3 …… Example I • Find I1 I1 3A 5A R R Answer • 8A Example II • Find IT IT 30V 5Ω 10Ω Answer • 9A Kirchoff’s Voltage Law • At any instant, the algebraic sum of the voltage changes (increases or decreases) in a loop in an electric circuit must be equal to zero. (the voltage drops across all resistors must add up to the total ) – VT = V1 + V2 …. Example III • Find the voltage change from points A to C (VCA) 6V C 3V 15V 2V A 8V Answer • 9V Example IV • Determine a) the current in R2 and b) the current through R3 10V R3 = 7Ω R2 = 4Ω IT = 2.2A R1 = 2Ω Answer • 1.4A, 0.8A