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# Appendix 6 prelab powerpoint

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Circuits Prelab - notes from class

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### Appendix 6 prelab powerpoint

1. 1. Electrical Circuits Pre-Lab Constructing and Analyzing A Simple Series Circuit
2. 2. Safety <ul><li>Only turn on power after circuit is connected </li></ul><ul><li>No loose long sleeves, rings, or bracelets </li></ul><ul><li>No food or drink </li></ul><ul><li>Keep miscellaneous objects away from circuit </li></ul><ul><li>Reverse terminal connections if meter needle moves backward </li></ul>link to electric shock jacket...
3. 3. Materials Voltmeter Voltage Source Resistors Breadboard + = Ammeter
4. 4. Finding the value of the unknown resistor using Ohm’s Law Voltage (V) is measured in Volts (V) Current (I) is measured in Amperes (A) Resistance (R) is measured in Ohms (Ω)
5. 5. Data to Collect <ul><li>2 Resistors connected in series </li></ul><ul><ul><li>Measuring resistance, current, and voltage </li></ul></ul><ul><ul><li>Current Readings </li></ul></ul><ul><ul><ul><li>Use the readings from your ammeter to fill out the table </li></ul></ul></ul>30 30 Ω   Total Current from Ammeter (I T )(amps)   Current in Unknown Resistor (I 1 )(amps)     Current in30 ohm Resistor (I 2 )(amps)
6. 6. <ul><li>Voltage Readings </li></ul><ul><ul><li>Use the readings from your voltmeter to fill out the table </li></ul></ul>Data to Collect (cont’d) Measured Voltage in Unknown Resistor (V R 1 )   (volts) Measured Voltage in 30 ohm Resistor (V R 2 ) (volts) Total Voltage from Source (V T ) (volts)
7. 7. Calculations <ul><li>Finding Total Resistance using 2 methods </li></ul><ul><ul><li>Method 1: </li></ul></ul><ul><ul><li>Method 2: </li></ul></ul>Voltage (V) is measured in Volts (V) Current (I) is measured in Amperes (A) Resistance (R) is measured in Ohms (Ω) Resistance (R) is measured in Ohms (Ω)
8. 8. Thought Provoking Questions <ul><li>Similar to lab writeup </li></ul><ul><ul><li>If you added another resistor to this circuit, what effect would it have on the size of the total current?   </li></ul></ul><ul><ul><ul><li>Use a relevant equation to explain </li></ul></ul></ul><ul><ul><li>If the total voltage supplied to the circuit remained unchanged, how much resistance must be added/subtracted to achieve a greater/lesser total current? </li></ul></ul>
9. 9. Lab Groups <ul><li>Division of labor </li></ul><ul><ul><li>Assign a group member to one of the following roles: </li></ul></ul><ul><ul><ul><ul><li>Recorder (Records data)  </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Reader (Reads instructions and checks off each procedure upon completion) </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Circuit Constructor and Meter Reader </li></ul></ul></ul></ul><ul><ul><li>Switch jobs 3 times during lab (V, I, Ω) </li></ul></ul><ul><ul><li>Initial any data that you recorded </li></ul></ul>
10. 10. Safety Revisited <ul><li>Only turn on power after circuit is connected </li></ul><ul><li>No loose long sleeves, rings, or bracelets </li></ul><ul><li>No food or drink </li></ul><ul><li>Keep miscellaneous objects away from circuit </li></ul><ul><li>Reverse terminal connections if meter needle moves backward </li></ul>