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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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 Spring '10
 Turner

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