PHYSICS
P219lecture06Resistors

# P219lecture06Resistors - Goal To explore the usefulness of...

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Goal: To explore the usefulness of Resistors and to understand their applications to electronic circuits. Objectives: 1) What is a resistor and how is it useful? 2) How resistances are found or made 3) The different resistor combinations: a) In series b) In Parallel c) Hybrid 1) Learn how to calculate how much the resistors affect the flow of current. 2) Power usage by resistors.

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Why are resistors useful?

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Resistors allow us to limit the flow of current in a circuit.
How calculated? Larger conduits offer less resistance. Some materials provide better flows than others. The further something has to flow the more resistance it will encounter. So, R = ρ L / A Here ρ is not density but is a substances resistivity (which can be looked up for any substance). While there is a little dependence on temperature the resistivity mostly depends on the substance and only the substance. Examples will come in recitation.

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Resistors in series:
Resistors in series: R eff = R 1 + R 2 + R 3 + R 4

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Sample:
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• Spring '10
• Physics, Resistance, Resistor, Electrical resistance, Series and parallel circuits, Reff

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