Objectives: - You need to be able to use the two equations above and the series and parallel circuit rules.
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1 F: Solve Complete Circuits Level 3 Prerequisite: Solve Ohm s Law and the Power Formula Points To: Solve Complete Circuit with Nontraditional Information Objectives: V = IR P = IV - Given a battery and 2-4 resistors, find the voltage, current, resistance, and power of each element of the circuit and the total circuit (which represents the battery). - You need to be able to use the two equations above and the series and parallel circuit rules.
2 Part C: Solving a Series Circuit The goal of these problems is to identify the voltage, current, and resistance of each element of a series circuit. Series Circuit Rules: 1: For each element and the total circuit, the formula V = IR. 2: The current is the same for every element. 3: The voltage and resistance add up to the total for each circuit element. C.1 A 12-volt battery, a 2-ohm resistor, and a 4-ohm resistor in series.
3 C.2 A 20-Volt battery, a 2-ohm resistor, and a 3-ohm resistor in series. C.3 A 30-volt battery, a 3-ohm resistor, and a 7-ohm resistor in series.
4 C.4 An 18-volt battery, a 1-ohm resistor, a 2-ohm resistor, and a 3-ohm resistor in series. Resistor 1 Resistor 2 Resistor 3 Total Circuit C.5 A volt battery, a 4.47-ohm resistor, and a 5.36-ohm resistor, and a 2.94-ohm resistor in series. [use a calculator for this problem, round each cell of the table to two decimal places] Resistor 1 Resistor 2 Resistor 3 Total Circuit
5 Part D: Solving Parallel circuit problems In a parallel circuit, the rules are slightly different. Parallel Circuit Rules: 1: For each element and the total circuit, the formula V = IR. 2: The voltage is the same for every element. 3: The current adds up to the total for each circuit element. 4: The resistance DOES NOT add up to the total. D.1. A parallel circuit with a 12-Volt battery, a 3-Ohm resistor, and a 6-Ohm resistor:
6 D.2 a parallel circuit with a 10 Volt battery, a 5-Ohm resistor, and a 10-Ohm resistor: D.3 a parallel circuit with a 20 Volt battery, a 2 Ohm resistor, and a 4 Ohm resistor:
7 D.4 A parallel circuit with a 6-volt battery and three 2-ohm resistors. Resistor 1 Resistor 2 Resistor 3 Total Circuit D.5 A parallel circuit with a volt battery, a 3.45-ohm resistor, a 2.58-ohm resistor, and a 8.12-ohm resistor. [use a calculator, round the answers to two decimal places] Resistor 1 Resistor 2 Resistor 3 Total Circuit D.6 Which rule is the same for series and parallel circuits? D.7 Which rules are different for series and parallel circuits?
8 Part F: Solving circuit problems with power New Rule: In both series and parallel circuits, the formula P = IV applies for each element. F.1 A series circuit has a 50-volt battery, a 10-ohm resistor, and a 15-ohm resistor. Power (W)
9 F.2 A series circuit has a 12-volt battery, and four-ohm resistor, and a six-ohm resistor. Power (W) F.3 A parallel circuit has a 15-volt battery, a 3-ohm resistor and a 5-ohm resistor. Power (W)
10 F.4 A parallel circuit has a 30-volt battery, a 15-ohm resistor and a 25-ohm resistor. Power (W)
11 Part G: Which type of circuit has brighter light bulbs? By now, you should have used the wire kits to build basic series and parallel circuits. Which type of circuit had brighter light bulbs? We are going to mathematically sow why this rule is true: You use two D-batteries. Each one has a voltage of 1.5 volts. What is the total voltage of your circuit? Assume that each light bulb has a resistance of 20 Ohms. First, imagine you connect the light bulbs in series. Draw a circuit diagram of your circuit. Include the voltage of the batteries and resistance of the light bulbs in your circuit: Solve the circuit: Light Bulb 1 Light Bulb 2 Total Circuit Power (W) What is the power of each bulb in the series circuit?
12 Second, you connect the light bulbs in parallel. Draw a circuit diagram of your circuit. Include the voltage of the batteries and resistance of the light bulbs in your circuit: Light Bulb 1 Light Bulb 2 Total Circuit Power (W) What is the power of each bulb in the parallel circuit? The power of a light bulb shows how much light energy each bulb generates. A light bulb with more power is a brighter light bulb. A light bulb with less power is a dimmer light bulb. Explain how the mathematics connects with what you observe in real life:
13 C C C C.4 Resistor 1 Resistor 2 Resistor 3 Total Circuit C.5 Resistor 1 Resistor 2 Resistor 3 Total Circuit
14 Results are rounded to 3 significant figures.
15 D D D D.4 Resistor 1 Resistor 2 Resistor 3 Total Circuit D.5 Resistor 1 Resistor 2 Resistor 3 Total Circuit All results are rounded to three significant figures.
16 D.6 Ohm s Law applies to both series and parallel circuits. D.7 In a series circuit, voltage adds and current is constant. In a parallel circuit, current adds, and voltage is constant In a series circuit, resistance adds up, while it does not in a parallel circuit. F Power (W) F Power (W) F Power (W) F
17 Power (W) Part G: For a series circuit: Light Bulb 1 Light Bulb 2 Total Circuit Power (W) For a parallel circuit: Light Bulb 1 Light Bulb 2 Total Circuit Power (W) In the series circuit, each light bulb has a power of Watts. In the parallel circuit, each light bulb has a power of 0.45 Watts, four times higher. Power describes the brightness of the light bulb, which means that the bulbs in parallel should be four times brighter. This is approximately what we observe. [Note: This calculation is slightly incorrect because light bulbs do not perfectly follow Ohm s Law, but it communicates the important point about series and parallel circuits.]
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