LAB 1 Circuits and Resistive Elements

# LAB 1 Circuits and Resistive Elements - Abstract In this...

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Abstract: In this experiment we learned how to measure voltage, current, and resistance using the equipment (multimeter) provided in the lab. Using the measured values and the calculated values we were able to verify that Kirchoff’s voltage law and Kirchoff’s current law apply to resistive elements. This experiment also allowed us to understand how some of the basic circuit elements work. We were able observed different resistors, a LED, and a photocell in different circuit layouts. This experiment thought us how to read the color coding of a resistor. In this experiment we also used a decade box to find the turn on voltage of an LED. We then got to observe how a photocell works in a circuit and verified the impact it has on the currents in series and parallel to it. Ultimately we were able to use everything we learned to create a practical night light circuit and then make our own custom circuit. Part 1: Resistive Measurement This part of the experiment explained to us how to distinguish the resistance of resistors. Each resistor has 4 colored bands. The first colored band represents the first digit of resistance and the second color band represents the second digit in the resistance. The third colored band tells us the multiplier that you would multiple the first two digits by to get the total resistance. The last colored band tells us the tolerance or variance each resistor has between the claimed resistance and the actual resistance it has. Table 1 shows the claimed resistance and the tolerance limits we calculated. Name Colored Bands Claimed Resistance Tolerance Tolerance Limits Measured Resistance R1 Brown, Black, Red, Gold 1k ohm 5% 0.95k-1.05k ohms 0.99k ohms R2 Orange, White, Red, Gold 3.9k ohms 5% 3.71k-4.09k ohms 3.87k ohms R3 Brown, Black, Orange, Gold 10k ohms 5% 9.50k-10.50k ohms 9.88 ohms R4 Blue, Grey, Red, Gold 6.8k ohms 5% 6.46k-7.14k ohms 6.74 ohms Table 1 (Resistor Measurements) In this part of the experiment we also measured the resistance across each resistor using a multimeter provided in the lab. This information is also present in table 1 above. As the table shows, the measured resistance for each resistor is within the tolerance limits the color bands on the resistor claims. After measuring the resistance of each individual resistor, we placed resistors R1 and R4

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## This note was uploaded on 03/21/2008 for the course ECE 200 taught by Professor Escuti during the Spring '07 term at N.C. State.

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LAB 1 Circuits and Resistive Elements - Abstract In this...

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