Current Electricity Lab Series/Parallel Circuits. Safety and Equipment Precautions!


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1 Current Electricity Lab Series/Parallel Circuits Name Safety and Equipment Precautions! Plug in your power supply and use ONLY the D.C. terminals of the power source, NOT the A. C. terminals. DO NOT touch wires together when the power supply is on. DO NOT leave the circuit with the power supply on for long periods of time! The resistors get VERY hot and may fry! You must disconnect ALL wires from the resistor BEFORE you measure the Resistances of the resistors! R=V/I or Procedure Part 1 Creating Circuits 1A. Using the SMALL wires, BULBS, and BATTERY, you and your electrician partner will build the following A circuit with two bulbs wired in Series. 2. A circuit with two bulbs wired in Parallel. * HAVE YOUR CIRCUIT CHECKED BY Mr. Putnam FOR REGENTS CREDIT! * Draw the circuits below that you have built making certain to use proper circuit symbols and labels! (Use your Reference Table for assistance with the symbols.) Series with 2 bulbs Parallel with 2 bulbs
2 Part 2 Using Ohm s Law in Series and Parallel Circuits IMPORTANT! Plug in your power supply and use ONLY the D.C. terminals of the power source, NOT the A. C. terminals. DO NOT touch wires together when the power supply is on. DO NOT leave the circuit with the power supply on for long periods of time! The resistors get VERY hot and may fry! You must disconnect ALL wires from the resistor BEFORE you measure the Resistances of the resistors! The Total Voltage ["Power Supply"] for both circuits must be set between 3 & 5 Volts. [Be certain to enter the ACTUAL voltage in the table.] You must disconnect the circuit BEFORE you measure the Resistances of the resistors! Have your Physics teacher check your circuit before you measure your values. SERIES CIRCUIT Create a SERIES circuit using &. Check the power supply FIRST with your multimeter to be certain it is set between 3 & 5 Volts. Fill out the table below. Measure the Voltage across Total Voltage (R 1 + R 3 ) Voltage TableSeries Circuit Voltage [V] TO TEST VOLTAGE Measure ACROSS THE RESISTOR & set the Multimeter to the 20V DC setting. Current TableSeries Circuit Measure the Current Current [I] BEFORE AFTER Total Current in circuit Using YOUR values for Total Voltage & Total Current in the above tables, CALCULATE the TOTAL RESISTANCE of the circuit using Ohm's Law. TO TEST CURRENT Set Multimeter to the 10A setting with probe wires plugged in as in the above diagram. Calculated Total Resistance of your Series Circuit à
3 WITH THE WIRES REMOVED FROM THE RESISTOR(S) MEASURE RESISTANCE Measure with the Digital Multimeter... The Resistance of CALCULATED [Using Ohm s Law] MEASURED [Using the Multimeter] PERCENT ERROR between the two Total Resistance values. Resistance [Ohms] TO TEST RESISTANCE Set Multimeter to the 200 Ω setting,. WITH THE WIRES REMOVED FROM THE RESISTORS BEFORE TESTING! PARALLEL CIRCUIT Create a PARALLEL circuit using &.. Check the power supply to be certain it is set between 3 & 5 Volts. Fill out the table below. Measure the Voltage across Total Voltage [Power supply] Voltage TableParallel Circuit Voltage [V] Measure the Current BEFORE AFTER Total Current TO TEST VOLTAGE Measure ACROSS THE RESISTOR & set the Multimeter to the 20V DC setting. Current TableParallel Circuit Current [I] TO TEST CURRENT Set Multimeter to the 10A setting with probe wires plugged in as in the above diagram.
4 Using YOUR values for Total Voltage & Total Current in the above tables, CALCULATE the TOTAL RESISTANCE of the circuit using Ohm's Law. Calculated Total Resistance of your Parallel Circuit à WITH THE WIRES REMOVED FROM THE RESISTOR(S) MEASURE RESISTANCE Measure with the Digital Multimeter... The Resistance of CALCULATED [Using Ohm s Law] MEASURED [Using the Multimeter] PERCENT ERROR between the two CALCULATED Total Resistance values. Resistance [Ohms] TO TEST RESISTANCE Set Multimeter to the 200 Ω setting WITH THE WIRES REMOVED FROM THE RESISTORS BEFORE TESTING! Conclusions Using your knowledge of electric circuits, answer the following #13à For SERIES circuits 1. A. What would happen to the Total Current of your circuit if you were to change from a twobulb series circuit to a threebulb series circuit? B. How could you tell from JUST LOOKING at the bulbs? 2. What would happen to the bulbs if one bulb blows out while doing the experiment? 3. What happens to the Total Resistance of your circuit if you added a bulb to the series circuit? #46à For PARALLEL circuits 4. A. What would happen to the Total Current of your circuit if you change from a twobulb parallel circuit to a threebulb parallel circuit?
5 B. How could you tell from JUST LOOKING at the bulbs? 5. What would happen to the bulbs if one bulb blows out while doing the experiment? 6. What happens to the Total Resistance of your circuit when you change from a twobulb parallel circuit to a threebulb parallel circuit? 7A. Why shouldn t you wire your entire home ONLY in parallel? 7B. What would happen to the Total Current throughout the home? 7C. What would happen to the fuses or circuit breakers in your home? 8. For the Series Circuit, if R 1 = 10Ω, R 2 = 15Ω, Ammeter A = 2A & the Total Voltage is 60V, find = R 3 = Total Current = Total Resistance = Total Power A 9. For the Parallel Circuit, if R 1 = 10Ω, R 2 = 25Ω, the Voltage drop across R 1 = 50V & the Ammeter A = 8A, find = R 3 = Total Potential Difference = Total Resistance A = Total Power
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