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Voltage Summary Theory: 1. Two resistors are placed in a series circuit with a 1.5 V Battery. In a series circuit the total battery voltage gets split up among the individual resistors. If you add each of the individual voltages together it will always equal the total voltage of the battery. Example V1 V2 50 100 1.5 V V1 is the voltage on a voltmeter placed across the 50 resistor, and V2 is the voltage measured by a voltmeter placed across the 100 resistor. The voltages are measured as follows: V1 = 0.5 V V2= 1.0 V Notice the voltage is divided proportional to the size of the resistance, but the two individual voltages combined equal the total battery voltage of 1.5V. 2. Two resistors are placed in a parallel circuit with a 1.5 V battery. When resistors are in parallel, each resistor is essentially connected directly to the battery. This means that each resistor gets the entire voltage of the battery. V1 Example 330 V2 V1 is the voltage measured by a voltmeter placed across the 330 resistor. V2 is the voltage measured by a voltmeter placed across the 20 resistor. 20 1.5 V V1 = 1.5 V V2 = 1.5V Notice both resistors have the same voltage across them. Part I: Equal Resistors Circuit A R1 = 100 R2 = 100 9.0 v R3 = 100 1. How many volts are across each resistor?_____ 2. How many volts are across two of the resistors?_______ 3. How many volts are across all three resistors?________ Circuit B 9.0 v R1 = 100 R2 = 100 R3 = 100 4. How many volts are across Resistor 1(R1)?_______ 5. How many volts are across R2?________ 6. How many volts are across R3?__________ Circuit C – questions 7-11 correspond to the following diagram 9.0 v R1 = 100 R2 = 100 R3 = 100 7. What is the equivalent resistance of R2 and R3 together( parallel) as shown on the previous page?_______ Remember 1 1 1 ... Req R2 R3 8. Re-sketch the above circuit by replacing R2 and R3 with one equivalent resistor. 9. What is the voltage across R1?______ 10. What is the voltage across R2 and R3?_________ (one answer) 11. What is the total voltage across R1, R2, and R3?_________ Part II: Unequal Resistors Circuit D – questions 12-16 correspond to the diagram below R1 = 10 R2 = 20 6.0 v R3 = 30 12. What is the voltage across R1?________ 13. What is the voltage across R2?________ 14. What is the voltage across R3?________ 15. What is the voltage across R1 and R2?_________ 16. What is the voltage across all three resistors?_________ Circuit E – questions 17-19 correspond to the diagram below 6.0 v R1 = 10 R2 = 20 R3 = 30 17. What is the voltage across R1?______ 18. What is the voltage across R2?______ 19. What is the voltage across R3?______ Note: V The circle with a V inside represents a voltmeter. The horizontal and vertical lines represent the voltmeter’s positive and negative wires which will be connected across a particular part of a circuit to measure the voltage.