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Resistors in Series Current Resistors in Parallel Current The current through each of the The current is divided between the resistors is the same and is equal to the resistors. This type of circuit is known as a current through the source. current divider. IT= I1 + I2+I3 Voltage Voltage The voltage of the source is divided between the resistors. This type of circuit is known as a voltage divider. The voltage drop across each of the resistors is the same and is equal to the voltage gain of the source. Resistance Resistance The total resistance of the circuit is equal to the sum of the individual resistances. The inverse of the total resistance is equal to the sum of the inverses of each of the individual resistances. Ohm’s Law Ohm’s Law Ohm’s law can be used to calculate the voltages, currents and resistances of the circuit. Ohm’s law can be used to calculate the voltages, currents and resistances of the circuit. Power Power The power rating of each resistor (brightness of the bulb) can be calculated by: The power rating of each resistor (brightness of the bulb) can be calculated by: The questions below should be completed with the PhET simulation, Circuit Construction Kit: DC (HTML5). This HTML 5 simulation will run right in your web browser on a computer or tablet. https://phet.colorado.edu/en/simulations/circuitconstruction-kit-dc Do not change the preset values for the voltage of the battery 9V or the resistances of the light bulbs 10 D. Learning Goals: a. I will know how adding bulbs in series affects the voltage drop across the bulbs. b. I will know how adding bulbs in series affects the total current through the c. d. e. f. circuit. I will know how adding bulbs in series affects the total resistance of the circuit. I will know how adding bulbs in series affects the brightness of the bulbs. I will know the voltage rule for resistors in series. I will know the current rule for resistors in series. Part 1: Series Circuit with three bulbs a. Using a battery, wires, a switch and 3 bulb make a circuit that lights the bulb. b. Using the correct symbols draw the circuit on a separate page. 3. Measure the voltage increase across the battery.9.00V 4. 5. Measure the voltage drop across each of the three light bulbs.3.00V for all Measure the total voltage drop across all three of the light bulbs.3+3+3=9 6. Measure the current through the battery.0.30A 7. Measure the current through each of the three bulbs.0.30 A for all 8. Compare the voltage increase from the battery to the voltage drop across each of the three bulbs. 9. Compare the current through the battery to the current through each of the three bulbs. 10. What happened to the brightness of the bulbs when the third bulb was added in series? 11. What happens to the brightness of the other bulbs if one bulb is taken out of the circuit? Summarize the Results of Your Investigation by Completing the Table Below Voltage Increase Battery Voltage Drop Across Each Bulb Total V V1= Current through the Battery Total I Current through the Bulbs I1= V2= I2= V3= I3= 12. Did the total voltage drop across each of the bulbs increase, decrease or stay the same as bulbs were added to the circuit? (circle the correct answer) Why did it do this? 13. Did the brightness of the bulbs increase, decrease or stay the same as bulbs were added to the circuit? (circle the correct answer) Why did it do this?

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