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Lecture 27a

# Lecture 27a - Chapter 27 DC Circuits Symbols for Electric...

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Chapter 27: DC Circuits

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2 Symbols for Electric Circuit Components. Capacitor stores charge and potential energy, measured in Farads (F) Battery generates a constant electrical potential difference ( D V) across it. Measured in Volts (V). Resistor resists flow of charge due to scattering; dissipates energy. Measured in Ohms ( W ) Light bulb (resistor)
pump High (+) reservoir Low (-) reservoir Worksheet 26 Circuit Water slide analogy A D C B Here, Energy is supplied by the battery and lost as heat in the resistor 𝑉 ? ≈ 𝑉? > 𝑉? ≈ 𝑉?

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Worksheet 26: Q8 What is the difference between a 60W light bulb and a 120W light bulb? (Both are designed to work in the U.S.) A. The 60W light bulb has higher resistance B. The 120W light bulb has higher resistance C. It has nothing to do with resistance 2 P i R 2 V P R 𝑃 = 𝑖𝑉
Single loop circuits: Rules Kirchhoff’s loop rule: If we traverse any loop of a circuit, the sum of the changes in potential equals zero. If I go across a battery from to plus change in potential = +V If I go across a resistor in the direction of the current, change in potential = - iR R i motion - V iR D ∆𝑉 = +𝑉 For the circuit above: +𝑉 − 𝑖𝑅 = 0 V

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6 R 1 R 2 R 3 Resistors in Series
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Lecture 27a - Chapter 27 DC Circuits Symbols for Electric...

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