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1.2.3 Pltw Poe Essay

1650 words - 7 pages

Activity 1.2.3 Electrical Circuits – Simulation

Introduction
Since the late 1800s, engineers have designed systems to utilize electrical energy due to its ability to be converted, stored, transmitted, and reconverted efficiently into other forms of energy. In the 21st century, electrical energy production, distribution, and application have become consumer driven. Today’s consumer utilizes electrical energy in all aspects of life, from cell phones and computers to refrigeration and heating and cooling systems, and even transportation. Electrical energy, depending on geographic location, is converted from mechanical energy, chemical energy, light energy, and thermo energy before it ...view middle of the document...

Your team will construct circuits using an online electricity simulator. You will use a virtual multimeter to measure properties within the circuit.
Introduction to Electric Circuits
Electric Circuit Schematics
Schematics are diagrams consisting of symbol representations and configurations of electrical components within a circuit. The table below illustrates circuit symbols to be used within schematics throughout this lab.

Component | Symbol | Pictorial |
Power supply(Battery) | | |
Conductive wire | | |
Resistor | | |
Open switchClosed switch | | |
Light bulb | | |
Voltmeter(Voltage readings)V | | |
Ammeter(Current readings)I | | |

Ohm’s Law
The relationship between current, voltage, and resistance within an electrical circuit was developed by Georg Simon Ohm and is known today as Ohm’s law. Ohm’s law states that the direct current flowing in an electric circuit is directly proportional to the voltage applied to the circuit. In other words, an electric circuit represents the flow of electrons along a conductive pathway between two points. This flow of electrons is referred to as current. What causes the electrons to move? A motivation, or voltage, causes the electrons to flow. Voltage refers to the potential difference, or amount of work to be done to move a charge from one point to another along an electric circuit. While electrons continuously flow along a given circuit, opposition to their movement is referred to as resistance.

It is important to understand the mathematical equation for Ohm’s law. Use the Ohm’s law table provided to work through activity practice problems and lab calculations.
Ohm’s Law | | | |
Equation | Variables | Units | Unit Symbols |
| | | |
| | | |

Practice Calculations
Draw the circuit schematic.
Identify the known and unknown values for each circuit.
Provide the appropriate unit for each measurement.
Show all steps for each calculation.

1. On a camping trip, you decide to use a cordless air pump to inflate an inflatable mattress. If the air pump is powered by a 9 volt battery with a resistance of 18 ohms, what is the amount of current flowing through the circuit?
Circuit Schematic | Calculations |
| V= IR9 = I * 181/2 = I.5 A = I |

2. A DJ uses a 110 volt outlet to plug in a strobe light. If the current flowing through the light is 0.050 amps, how much resistance is within the circuit?
Circuit Schematic | Calculations |
| V = IR110 = .05 * R22 = R22 Ω = R |

3. You finally found the MP3 player that you have wanted for months. While you are waiting in the check-out line, you read the back of the packaging. The manufacturer has guaranteed that the player will perform consistently with a resistance of 40 ohms and a current of 0.1 amps. What is the voltage for the MP3 player?
Circuit Schematic | Calculations |
| V = I * RV = .1 * 40V = 4 |

Constructing Circuits
Your team will construct a series and parallel...

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