Content Outline for Teaching - Potosi School District - Home
Content Outline for Teaching - Potosi School District - Home
Content Outline for Teaching - Potosi School District - Home
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7<br />
<strong>Content</strong> <strong>Outline</strong><br />
<strong>for</strong> <strong>Teaching</strong><br />
Electricity and Magnetism<br />
Underlined words and<br />
phrases are to be filled<br />
in by students on the<br />
Note-taking Worksheet.<br />
Section 2<br />
Electric Current<br />
A. Electric current—the flow of electric charge.<br />
1. As a current flows in a wire, the number of electrons and protons in the wire<br />
remains balanced.<br />
2. The SI unit of electric current, the ampere, is designated by the symbol, A.<br />
B. Electric circuit—a closed path through which electric charges can flow.<br />
1. The measure of how difficult it is <strong>for</strong> electrons to flow is the electric resistance<br />
of a material.<br />
2. The unit of electric resistance is the ohm.<br />
3. In a series circuit, devices are connected so that there is only one path <strong>for</strong><br />
current to follow.<br />
4. In a parallel circuit, there is more than one path <strong>for</strong> current to follow.<br />
C. Voltage—a measure of the electrical energy transferred by electrons flowing in a<br />
circuit.<br />
1. A battery trans<strong>for</strong>ms chemical energy into electrical energy.<br />
2. Ohm’s law—voltage, current and resistance in a circuit are related by the <strong>for</strong>mula<br />
V IR.<br />
Discussion Question<br />
All of the lights in a string go out when one bulb burns out. What can you<br />
conclude about the electric circuit of the string? The string of lights is a<br />
series circuit because the burned out bulb breaks the circuit.<br />
Electricity and Magnetism 21
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