ࡱ> Z` Y$jbjb |c|c%>>>>TOOO8OL@PTPR"RRRMMMUWWWWWW,R-M;MMM}>>RR-}}}M6>ZRRU}t J>>>>MU}}mP LMOF07j}}TT(X/d TTX/ Name________________________________ Physics Lab: Ohms Law, Kirchhoffs Laws, Potentiometer, Photocell, Voltage Divider, Wheatstone Bridge Objectives: By the end of this lab, the student will be able to understand: the equations for a voltage divider and be able to build it how a potentiometer works how the resistance of a photocell changes with different light levels how to use a DMM to measure voltages and resistances in a circuit. how a Wheatstone bridge works and how to apply it. Part I: Voltage Divider Obtain three resistors, measure their resistance with an ohmmeter, and fill in the chart below. R1 R2 R3 color codenominal R1.8 kW2 kW4.7 kW measured R Build a voltage divider. The three representations are equivalent. (Do you see why?)_  What is the measured voltage EMBED Equation.3 across the battery? Vin = __________ What is the measured voltage at EMBED Equation.3 (wrt ground)? Vout = __________ Given  EMBED Equation.3 ,  EMBED Equation.3 , and EMBED Equation.3 , derive an equation for EMBED Equation.3 . Show that your measured value is consistent with the predicted value. What will EMBED Equation.3 be (approximately) if  EMBED Equation.3 << EMBED Equation.3 ? What will EMBED Equation.3 be if  EMBED Equation.3 = EMBED Equation.3 ?What will EMBED Equation.3 be (approximately) if  EMBED Equation.3 >> EMBED Equation.3 ?Do you see why this is called a voltage divider? Part II: Potentiometer The potentiometer (pot) is a device that can provide a variable resistance. It can be used, for example, as the volume control knob of an amplifier. Turn the knob of the potentiometer as far as it will go in the counterclockwise (ccw) direction. Using the ohmmeter, find the range of resistance values spanned by your potentiometer (use contacts 1 and 2) by turning the knob clockwise. How many turns does it take to span the full range of resistance? (Contacts 1 and 3 span the max range of R. If you do not get a reading that agrees with what is printed on the pot, then get another one). Full range of resistance: ______________ Number of turns to span full range of resistance: _____________ Study the two diagrams below. These voltage divider circuits enable you to obtain a variable output voltage. Indicate on the diagrams which potentiometer contacts you would use to build this circuit. Build the circuits, and measure the range of values for  EMBED Equation.3 . Note: If you connect contacts 1 and 2 directly to the battery, you can burn out the potentiometer.      EMBED Equation.3 = ________________________(range of values)  EMBED Equation.3 = ___________________________(range of values)Using the expression derived in Part I and the range of resistance values for the potentiometer, show that the predicted values of EMBED Equation.3 are consistent with the measured values.   Set up the potentiometer so that the voltages are applied to the terminals in the following way. What values of Vout do you obtain? Part III: Wheatstone Bridge We can use the potentiometer to understand an important circuit known as the Wheatstone bridge. This circuit is often used to measure the resistance of an unknown device. For example, if R1, R2, and R3 are known, then this bridge circuit can be used to find the unknown resistance R4.  Build this circuit, but replace R4 with a potentiometer. Insert a galvanometer or ammeter where the G is shown. Adjust the pot so that no current flows through the galvanometer. At this point, the voltage Vg across the galvanometer is zero, and the bridge is said to be balanced. What can you conclude about the relationships among the voltage drops and currents in this balanced circuit? Find a formula to determine R4 from the three known resistors. Calculate the value of R4 from the known resistances R1, R2, and R3. Use the ohmmeter to measure R4. (Be careful! Dont move the shaft of the pot when you make this measurement.) What is the percent difference between your measured and calculated values of R4? Measured value of R4: __________ Calculated value of R4: _________ Percent difference: ____________ The Wheatstone bridge is a useful tool in electronics. Once the circuit is balanced with the potentiometer, any disruption to the resistance in the circuit will cause a current between points C and B and a nonzero voltage Vg. This current can then be used to open a door, move a robot, set off a burglar alarm or in this case turn on emergency lights during a fire. 1. Your task is to use the Wheatstone bridge to create a circuit that will light a bulb when the temperature surrounding a thermister rises. Define thermister: A semiconductor resistor whose resistance varies rapidly and predictably with temperature. Show that the resistive value of a thermister lowers as you raise its temperature. The thermistor is ~15K at room temp and ~1K when hot. In this lab, the light bulb will be a light emitting diode. The LED will only light when a current passes through it in the correct direction. Draw the circuit symbol for an LED and indicate which way current must flow in order for it to light up. 2. You will be given two fixed resistors, a potentiometer, a thermister and an LED. In the space below, neatly draw a circuit diagram. Think carefully about the placement of the components in the diagram. The pot should be placed to balance the thermister and the LED should light when the resistance of the thermister lowers.  3. Construct the circuit on the breadboard. Start by placing the voltmeter between points CB so that you can test how the voltage varies as you adjust the pot. Use the pot to balance the bridge so that Vg equal zero. Add the LED. As you turn the pot, the LED should light. Adjust the pot so that the LED just becomes dim. 4. Obtain a beaker of hot water and test your circuit. Using the concept of the Wheatstone bridge, explain in detail what happens. The bridge is nulled so the LED is dark. (Actually a bit of forward bias speeds the response.) When the thermistor heats up, Vg increases and the LED lights. Part IV: Photocell A photocell is a device that changes resistance when it is exposed to light. Measure its resistance when a laser beam hits it, when it is exposed to ordinary room light, and when your hand covers the face.   EMBED Equation.3 (exposed to laser) = _______  EMBED Equation.3 (ordinary room light) = _______  EMBED Equation.3 (covered by hand) = _______ The circuit on the right is a voltage divider. Predict the value of Vout when a laser shines on the photocell. Then measure the value. Light on photocell: Predicted value of Vout: __________ Measured value of Vout: _______________ Do the same when your hand covers the photocell. No light on photocell: Predicted value of Vout: __________ Measured value of Vout: _______________     PAGE  PAGE 1 B 2K 4.7K 12 V 6 V Vout wiper wiper  EMBED Photoshop.Image.6 \s  C Vg 1K - 1.8K -12 V Vout 6V wiper Vout 6V R3 Fig. A Fig. B Vout 10K ,. 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