Download Voltage, Current, Resistance and Ohm's Law - Experiment | PHY 440 and more Lab Reports Basic Electronics in PDF only on Docsity! Voltage, Current and Ohm’s Law. p. 1 Voltage, Current, Resistance and Ohm’s Law Goals of Experiment: To gain familiarity with the ideas of voltage, current and resistance and to become familiar with the tools and equipment used in simple electrical measurements. Necessary Equipment 1. Resistors of various sizes 2. Digital Multimeter (DMM) 3. Protoboard 4. Voltage Supply 5. Potentiometer Procedure 1. Use a DMM to read the voltage of a power supply. 2. Use the resistor color code to find a 33 kΩ and a 1 kΩ miniature carbon film resistors. Check these values with a DMM. Are the DMM readings consistent with the tolerance rating marked on the resistor? 3. The power rating of a resistor depends on its size. Using the vernier calipers measure the length and diameter of one of your resistors. Compare your measurements with the data on Panasonic 5% Miniature Carbon Film Resistors as given on the data sheet to determine its power rating. What is it? 4. Fit the DMM with alligator clips and wire leads to make a continuity checker. Use it to discover the arrangement of connections on a protoboard. Which holes are connected? 5. Use a DMM to measure the resistance of a 1 MΩ resistor while holding one resistor lead in the fingers of your left hand and the other resistor lead in the fingers of your right hand. Repeat the measurement in a way that gets your body out of the circuit. Do you find a difference? Would you expect to find a difference if the resistance to be measured was 10 kΩ? Try it. 6. Predict and measure the combined resistance of: A) 82 kΩ and 100 kΩ in series. B) 82 kΩ and 100 kΩ in parallel. 7. The circuit in Figure 1 is known as a voltage divider. You can build it on a protoboard. A) Predict and measure the voltages V1 and V2. Compare with the supply voltage. B) Predict the battery current. Use the DMM to measure it. C) Suppose the 82 kΩ resistor is shorted. Predict the battery current and the current through the 100 kΩ resistor. Use the DMM to measure these. Figure 1: Resistors in Series.
