Experiment 4

# Experiment 4 - 1 Experiment 4 ALTERNATING(AC CIRCUITS PHY...

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1 Experiment 4. ALTERNATING (AC) CIRCUITS PHY 134 (Section 11)

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2 Purpose The experiment was done to learn about voltages that change with time using the Cathode Ray Oscilloscope. Apparatus Function Generator, Oscilloscope, Speaker, Resistor (R=10 3 Ω), Capacitor (10 -8 F) and red and black wires. Theory The magnitude and direction of current of Alternating Circuit (AC) vary cyclically, unlike DC. The usual waveform of an AC circuit is a sine wave, which is the most efficient transmission of energy. The function generator (FC) provides output voltages which vary with time in a periodic manner. Three different types of output voltage signals are provided by the FG: sine wave, square wave, and triangular wave. The Oscilloscope provides measurement of voltage signals, steady or time dependent. Capacitor is an electric circuitry component which can store charge. Ability to store charge is measured in Farads and is called capacitance. Capacitance voltage (Vc) = Vo (1-e -t/T ) when charging, and T is the time constant. The time constant (T) = RC. When discharging, Vc=Vo *e -t/T .
3 Procedure The first experiment, measurement of Frequency f, was done using the FG. The mode of FG was set to sine wave, frequency coarse switch at 10

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## This lab report was uploaded on 04/10/2008 for the course PHY 134 taught by Professor Chang during the Fall '07 term at UMass (Amherst).

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Experiment 4 - 1 Experiment 4 ALTERNATING(AC CIRCUITS PHY...

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