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LAB_8 - Time Varying 2 - Lab 8 Time Varying Signals II The...

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Lab 8 91 Time Varying Signals II Summary In the previous experiment entitled Time Varying Signals I we used both the oscilloscope and the DMM to examine the nature of square and sinusoidal voltages. In this experiment we will use the same equipment to determine how to calculate the RMS voltage when the signal is not sinusoidal. It is a com- mon misconception to believe that the RMS voltage of an arbitrary AC signal is equal to its maximum value or amplitude divided by , that is: Although we proved this formula for sinusoidal signals, it is not valid for other AC signals in general. We will also examine the behavior of AC signals to see if they conform to the same basic laws that hold for DC signals such as: Ohm’s Law ( ), and Kirchoff’s Voltage and Current Laws. Educational Objectives After performing this experiment, students should be able to: 1. Demonstrate and measure AC voltage. 2. Use a function generator and an oscilloscope. 3. Make AC measurements in series and parallel resistive circuits. 4. Measure and understand the relationship between the amplitude and effective value for AC voltages. 5. Verify Kirchoff’s Laws for AC Circuits. “The future belongs to those who believe in the beauty of their dream.” - Eleanor Roosevelt 2 V V rms max = 2 V IR =
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Lab 8 92 Background Information In this experiment, you will construct two circuits with the use of a solderless breadboard. The breadboard is used to create temporary circuits for learning and testing purposes. The breadboard has many columns of holes or sockets that you insert the leads of components or wires needed to build a cir- cuit. Each point along the top blue row is connected by a wire strip in the breadboard. Similarly for the top red row and the two bottom rows. Each column above the middle divide has five connected points.
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