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Series and Parallel Resistances

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Series and Parallel Resistances 5/27/14 Objectives Series and parallel • Calculate the equivalent resistance for resistors connected in both series and resistances parallel combinations. • Construct series and parallel circuits of lamps (resistors). • Observe and explain relative lamp brightness in series and parallel circuits. Assessment Assessment 1. Two resistors with resistances of 10 Ω and 30 Ω are 2. Two resistors with resistances of 10 Ω and 30 Ω are connected in series with a 20 volt battery. connected in parallel with a 20 volt battery. a) What is the equivalent resistance of the circuit? a) What is the equivalent resistance of the circuit? b) What is the current flow through the circuit? b) What is the current flow through the circuit? Assessment Physics terms 3. If you connect these two identical resistors as shown, will they together draw more or less current than one • series circuit of the resistors alone? • parallel circuit • equivalent resistance 1 5/27/14 Equations Series circuits A series circuit has only one path for the flow of electric current. Equivalent resistance for resistors connected in series I I I Equivalent resistance for resistors connected in parallel Parallel circuits Investigation In a parallel circuit the electric current can split apart and What are the advantages come back together again. and disadvantages of series versus parallel circuits? V V In Investigation 17D you will create circuits of lamps wired in parallel and series (page 491). Investigation Investigation Insert one lead of lamp/socket into one Part 1: Connecting lamps in series Part 1: Connecting lamps in series row of the breadboard... 1. Connect a +3 V voltage source 3. Create a circuit with two lamps (or two D-cell batteries) to the in series. Compare the breadboard. brightness of the two lamps to the previous circuit with one 2. Insert the lamp into the lamp. breadboard to create a one-lamp circuit. Observe its brightness. Was your prediction correct? Predict: What will happen to lamp ...and the other lead of the brightness if you connect a second same lamp/socket into a lamp in series? different row of the breadboard. 2 5/27/14 Investigation Investigation Questions for Part 1 Part 2: Connecting lamps in parallel a. What property makes this a 1. Create a circuit with two lamps series circuit? in parallel. b. How bright are the lamps in 2. Compare the brightness of the series compared to the single lamps in this circuit to the prior lamp? Why? circuit with two lamps in series. c. Remove one lamp from the series circuit. What happens Which arrangement has more to the other lamp? Why? current flow through the lamps? Investigation Designing a circuit Questions for Part 2 Design a circuit of three lamps that combines series and parallel arrangements. a. What property makes this a parallel circuit? • Sketch the circuit diagram. b. How bright are the parallel lamps • Predict the relative bulb brightness. compared to the series lamps? Compared to the single lamp? Why? • Build the circuit and test your predictions. c. Remove one lamp from the parallel • Is there a second way you could have circuit. What happens to the designed your circuit? brightness of the other lamp? Why? Series circuits Series circuits The battery and the resistors in these circuits are identical. The circuit with 3 resistors is 3 times harder for What is different about these circuits? the current to flow through. I1 I2 I3 When you add resistors in series, equivalent resistance increases and current flow decreases: I3 < I2 < I1 3 5/27/14 Equivalent resistance Equivalent resistance What is “equivalent resistance”? These two circuits have the same total resistance . • Equivalent resistance is the total combined resistance of a group of resistors. • Equivalent resistance has the value of a single resistor that could replace the multiple resistors in a circuit, while keeping total current through the circuit the same. so they will have the same total current, I. Equivalent resistance: series Exploring the ideas For resistors in series, you can find the equivalent resistance by simply adding up the individual resistances: Click this interactive on page 488 Engaging with the concepts Engaging with the concepts A 10 Ω resistor, a 15 Ω resistor, A 10 Ω resistor, a 15 Ω resistor, and a 5 Ω resistor are connected and a 5 Ω resistor are connected in series. in series. What is the equivalent resistance What is the equivalent resistance of this arrangement? of this arrangement? 10 15 5 30 10 15 5 10 Ω + 15 Ω + 5 Ω = 30 Ω 4 5/27/14 Engaging with the concepts Engaging with the concepts Two strings of tree lights, each Two strings of tree lights, each with a resistance of 150 Ω, are with a resistance of 150 Ω, are connected together in series. connected together in series. What is the Req? What is the Req? 300 Ω 150 150 0 When you add resistors in series 300 150 150 0 does Req increase or decrease? Does total current increase or decrease? Engaging with the concepts What is the Req of each circuit? Two strings of tree lights, each with a resistance of 150 Ω, are connected together in series. What is the Req? 300 Ω When you add resistors in series 450 150 150 150 does Req increase or decrease? Req increases Does total current increase or Req = _______ Req = _______ decrease? I decreases What is the Req of each circuit? How much current flows? Ω Ω Ω Ω Req = 10 Req = 15 Req = 10 Req = 15 5 5/27/14 How much current flows? Parallel circuits A parallel circuit has more paths for electric current to flow. The circuit on the right lets twice as much current flow. 1 A 0.67 A ½ What is the Req for the parallel circuit? R 2R R Parallel circuits Equivalent resistance: parallel In the circuit with parallel resistors: When you add resistors in parallel, total resistance goes DOWN. total current flow doubles because total resistance is halved. To find the Req you must add the inverse of the resistances: ½ What is the Req for the parallel circuit? R 2R R Equivalent resistance: parallel Equivalent resistance: parallel Don’t forget to flip the fraction at the end! If you have two 4 Ω resistors in parallel, what is If you have two 4 Ω resistors in parallel, what is the equivalent resistance? the equivalent resistance? A. ½ Ω B. 2 Ω C. 4 Ω D. 8 Ω A. ½ Ω B. 2 Ω C. 4 Ω D. 8 Ω 6 5/27/14 Exploring the ideas Engaging with the concepts A 10 Ω resistor and a 15 Ω resistor are connected in parallel. What is the Req of Click this this arrangement? interactive on page 490 10 15 Equivalent resistance Engaging with the concepts Engaging with the concepts A 10 Ω resistor and a 15 Ω Two strings of lights, each resistor are connected in with a resistance of 150 Ω, parallel. What is the Req of are connected together. this arrangement? 6 ohms What is the Req when the strings are connected in parallel? 6 10 15 150 150 Equivalent resistance Equivalent resistance When resistors are connected in parallel, total resistance decreases. Engaging with the concepts What is the Req of each circuit? Ω Two strings of lights, each These are all 10 resistors. What is the Req in each case? with a resistance of 150 Ω, are connected together. What is the Req when the strings are connected in parallel? 75 Ω 75 150 150 Equivalent resistance Req = ____ Req = ____ Req = ____ The total resistance is always less than any of the individual resistors added in parallel! 7 5/27/14 What is the Req of each circuit? How much current flows? Ω These are all 10 resistors. What is the Req in each case? Apply Ohm’s law ( V = IR ) to find the total current through the battery. Ω Ω Ω Ω Ω Ω Req = 10 Req = 5 Req = 3.3 Req = 10 Req = 5 Req = 3.3 Adding resistors in parallel makes the total resistance decrease. I = ____ I = ____ I = ____ How much current flows? Analogy for resistors in series Apply Ohm’s law ( V = IR ) to find the total current through the battery. What happens to the potential How is this analogous to energy of the water as it passes the voltage drops across through each water wheel? each resistor? Ω Ω Ω Req = 10 Req = 5 Req = 3.3 I = 3 A I = 6 A I = 9 A Voltage drops: resistors in series Voltage drops: resistors in series 10 V drop 10 V drop Resistor in series Half as much current flows in the series circuit. Single resistor What are the voltage drops across the two resistors in series? 8 5/27/14 Voltage drops: resistors in parallel Voltage drops: resistors in parallel 4 A 4 A 20 V drop Single resistor Resistor in parallel Twice as much current flows in the parallel circuit. What are the voltage drops across the resistors in parallel? Each resistor in parallel has the full 20 V drop. Assessment Assessment 1. Two resistors with resistances of 10 Ω and 30 Ω are 1. Two resistors with resistances of 10 Ω and 30 Ω are connected in series with a 20 volt battery. connected in series with a 20 volt battery. a) What is the equivalent resistance of the circuit? a) What is the equivalent resistance of the circuit? b) What is the current flow through the circuit? b) What is the current flow through the circuit? Assessment Assessment 1.
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