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Physics Parallel Circuits Key Terms Parallel circuits- Old ones… Voltage(v) Current (I) Resistance (R) Series circuit- Lesson Objective All of the Students will be able to apply what they know to 3 parallel resistors to solve 4 out of 5 questions correctly on an exit ticket. You will be successful if… Make a checklist of the following items and check yourself off during the lesson. You can determine the difference between series and parallel circuits using today’s lab experiment. You can “map” and solve for current and resistance in a circuit with 2 resistors. You can “map” a circuit with 3 resistors. Introduction In your lab today, you took data about lights in a series and in parallel. What did your data imply about how much voltage series lights get as you add more lights? What can you imply about parallel circuits knowing this? Review In series circuits, the current was always the same. Voltage decreased with each resistor until it hit zero at the end. Diving in For a Parallel circuit, Current is what changes, and voltage is the same for all 3 resistors. Voltage across all parallel elements in a circuit will always be the same Fun video or picture describing subject Deep Since in a parallel circuit, they all are equally close to the battery, the voltage is the same, but each resistor is different, and since the voltage they receive is the same, What does Ohm’s Law say should happen to the current for each resistor? Will it be the same? Why? Heavy Lets solve one together. Copy the circuit at right. See how resistance and Voltage are given. Note: Current is divided into 3 separate parts, I1, I2, and I3. Heavy We have ohms law V=IR, so we need to find ITotal for the circuit. To do this, use Ohm’s law for each resistor. Heavy You should have gotten 8 amps for I1 6 amps for I2, 12 amps for I3. Heavy Your total Current will be??? Heavy Now, what about resistances? Well… Were going to use the second equation here to find the total resistance for the circuit. E E E E RT R1 R2 R3 1 1 1 1 RT R1 R2 R3 GT G1 G 2 G 3 Lecture exit ticket If V= 120 volts, Itotal = 30 amps, Find Rtotal . If R1= 10Ω and R2=15Ω and R3 is unknown What value is R3? Copy link to peardeck! Pear deck www.peardeck/join