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ac currents

# ac currents - i 10^2 x 1 = 100 Hz ii 10^4 x 1.5 = 15,000 Hz...

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Chrissy Henderson SI#: 17287266 Physics 134 LAB 2, Wednesday 12:20 9 March 2005

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I. Objective The objective of Lab 3, Alternating Circuits (AC), was to familiarize ourselves with the Function Generator and the oscilloscope, and to use this equipment to learn about voltages that change with time. We used a function generator (FG), which provides output voltages that vary with time. The function generator outputs three different voltage signals: sine wave, square wave, and triangular wave. Using this, we performed three different experiments finding the frequency, using a speaker, and using a wooden board. II. Data A. Graphs: See attached pages. a. Period = T = 2 boxes = 1msec/Div b. Sec/Div = .5m / 2 Div = 1 sec c. f = (1/T) = (1/.001) = 1000 Hz B. Normal audible range: 20 to 20,000 a. Experimental Range, Coarse Setting : Fine Setting = Hz
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Unformatted text preview: i. 10^2 x 1 = 100 Hz ii. 10^4 x 1.5 = 15,000 Hz b. Our audible hearing range was less than the average, possibly due to the machines, other noises in the room, or our slight inability to hear. C. RC Time Constant a. Square Wave: R = 10^3 Ω; f = 10^4 Hz; C = 1*10^-8 F; SEC/DIV = 2 x -5 s b. Using the dual trace button: i. .63 (6 Blocks) = 3.8 ii. 2 x 5μ = 1 x 10^-5 μ III. Conclusion This lab has shown that time-dependent voltages vary with time and the type of current. We used electrical current to observe the change in voltage; as shown in the lab, we were even able to use our own voices and observed the voltage output. This lab, though confusing since several new pieces of equipment were used, was helpful in the sense that it introduced new concepts and introductory notions relating to voltages....
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