StudyGuideChapter28 - Direct Current Circuits Study Guide...

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Direct Current Circuits Study Guide for Chapter 28 Outline 1–2. Electromotive Force Most direct current circuits are powered by a battery or power supply that produces a constant potential difference between its two ends. Such a potential difference is known as electromotive force emf (or ). This is not a good name—electromotive force is not a kind a force, it is a potential difference. 3–4. Analyzing Circuits You can analyze any circuit using . Kirchhoff's voltage law states that: Kirchhoff's laws The sum of the potential changes around any closed loop in a circuit must be zero. Make sure to count potential increases as positive, and potential decreases as negative. Remember: The potential on a battery increases from the minus side to the plus side. The potential across a resistor decreases in the direction of the current. Kirchhoff's current law states that: The current flowing into any junction or device is equal to the current flowing out.
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StudyGuideChapter28 - Direct Current Circuits Study Guide...

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