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physicslab7 - La b 7: Voltage, Current, and Resistance I...

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La b 7: Voltage, Current, and Resistance I Staci Williams Nicole Harty, Kevin Schesing, Caitling Kubota
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Section 015
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Theory: Voltage Two points have a voltage between them if work is done by the electric field as a charge is moved from one of the points to another. Voltage is the work done on a unit positive charge by the electric field as the unit positive charge is moved from one of the two points to the other point, with units of joules per coulomb, or volt. Wires have resistance and are carrying currents, and the wire is not at equipotential. The earth is not a good conductor. Voltage can be supplied by batteries, power supplies, and signal generators. Ideal voltage sources maintains the prescribed voltage across the terminals no matter how much current is supplied, but these do not exist. Voltage can be seen as a function of time and the voltage across the terminals of a signal generator may repeat itself in a length of time called the period. The voltage for one period is called one oscillation or one cycle. The inverse of the period is frequency, which is the number of periods or oscillations per second. The shape of the voltage vs. time graph is called the waveform, which may vary in shapes such as sine, square, triangular, and ramp. Voltage can be
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This note was uploaded on 05/08/2010 for the course PHYS v12 taught by Professor Adler during the Spring '10 term at NYU.

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physicslab7 - La b 7: Voltage, Current, and Resistance I...

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