Sample Prelab - DC 2 & 3 ESET 210

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Electrical Engineering

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Feb 20, 2024

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Pre-Lab Experiment DC 2&3 1 Kirthika Piratla Pre-Lab Experiment DC 2 & 3 Kirthika Piratla 231007008 Section 507

Pre-Lab Experiment DC 2&3 2 Kirthika Piratla Pre-Lab Experiment DC 2: Resistors and the Color Code Purpose: In this experiment, color code resistance readings from the given resistors are compared to the resistance values measured using the VOM and the DMM. Resistors are used to regulate the flow of current in electronic circuits. The wattage of a resistor is indicated by its size. The color code identifies the resistive value and the percent tolerance of the resistor, and will be compared to measured multimeter and milliammeter values to test the accuracy of the reading. Materials: Resistors: - 1 1-MΩ, 1-W film resistor - 1 1-MΩ, 2-W film resistor - 1 1-MΩ, ½-W film resistor - 1 6.8-Ω, 91-Ω, 220-Ω, 3.3-kΩ, 10-kΩ, 470-kΩ, 1-MΩ, ¼-W film resistors Instruments: - 1 VOM (Volt-Ohm-Milliammeter) - 1 DMM (Digital Multimeter) Procedure: 1) Body Size: Draw the physical sizes of the resistors and label them according to their wattage rating. Note the ratios of the sizes of the 2-W compared to the 1-W and the 1-W compared to the ½-W. 2) Color Code: Determine the color bands on each resistor in the kit and note the colors in order. Note their associated numerical values according to a resistor color code chart. Multiply the percent tolerance by the nominal resistance level to get the uncertainty, and apply the uncertainty to the nominal resistance to get the maximum and minimum resistance levels. Read the resistance levels of each resistor using the DMM using the appropriate scale for each measurement and find the difference between the nominal and measured values using the following equation. Observe whether each resistor fell under the tolerance range. % 𝐷𝑖???????? = ???𝑖?𝑎? −??𝑎????? ???𝑖?𝑎? | | | | × 100% 3) Repeat Step 2 using the VOM. 4) Body Resistance: Guess the resistance of your body between the ends of your hands. Then, measure and note the actual resistance using the DMM. Wet your fingers and firmly hold one lead in each hand. Calculate how much voltage would be required to pass a current of 10 mA through your body using the following equation. 𝑉 = 𝐼𝑅 5) Meter Resistance - Voltmeters: Note the Ω/V rating beneath the VOM scale. The internal resistance of each setting can be found using the equation below. Then, find the internal resistance of the VOM using the DMM as an ohmmeter and find the percent difference between the calculated and measured values. 𝐼?????𝑎? ???𝑖??𝑎??? = ?𝑎?𝑖??? ????𝑎?? ??𝑎?𝑖?? × Ω/𝑉 ?𝑎?𝑖?? Use your lab neighbor’s DMM to measure the internal resistance of each dc voltage scale of your DMM and compare its specified resistance to its measured resistance. If the reading is more than the max resistance that the DMM can read, truncate the value to the max resistance. 6) Meter Resistance - Ammeters: Measure the resistance of each dc current scale of the VOM using the DMM as an ohmmeter. Then, using the VOM as an ohmmeter, measure the resistance of each current scale of the DMM. Observe which meter would least disturb the network with its resistance. Ideally, meter resistance should be as small as possible.

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