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Current And Voltages
 

Current And Voltages

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    Current And Voltages Current And Voltages Presentation Transcript

    • Introduction to Electronics Unit One: DC Circuits Section Three Current and Voltage
    • Current, Voltage and Power
      • Students will be able to:
      • Explain that energy is transformed, not created.
      • State types of energy.
      • Define
        • Electron
        • Current
        • Voltage
        • Power
      • Examine the relationship between current, voltage and power.
      • Name the symbol for current, voltage and power.
      • Tell the unit and unit symbol for current, voltage and power.
      • Calculate missing elements using the ampere formula.
      • Calculate missing elements using the power formula.
      • Predict the effect of connecting batteries in series or parallel form.
    • Current
      • Current is the flow of electrons within an electrical circuit.
      • The word current is represented in formulas using the letter I.
      • Current is measured in amperes (amps).
      • Amps are represented in formulas using the letter A.
      • Current moves away from a negative charge and towards a positive charge.
    • What is an Ampere?
      • Ampere (A) represents the amount of electrons that flow past a point in a circuit in one second.
      • Formula: I = Q/t
      • The word coulomb is represented in formulas using the letter Q.
      • 6,280,000,000,000,000,000 electrons equals one coulomb (C).
      • One coulomb moving past a point in one second equals one ampere.
      • Time is represented by t, and using the units of seconds (s).
    • Calculating Amperes (I)
      • Calculate the current moving past a point in a circuit if 24 coulombs travel past it in 6 seconds.
      • How long would it take 30 coulombs to travel past a point if the circuit had a current of 5 amps?
      • How many coulombs would travel past a point in 5 seconds if the circuit had a current of 7 amps?
    • Answers to Ampere Questions Q = 35C t = 6s I = 4A Q = 7A(5s) t = 30C / 5A I = 24C / 6s Q = It t = Q/I I = Q/t I = 7A Q = ? t = 5s I = 5A Q = 30C t = ? I = ? Q = 24C t = 6s
    • Voltage
      • Voltage is a force that moves the electrons in a circuit.
      • The word voltage is represented in formulas using the letter E.
      • Voltage is measured in volts.
      • Volts are represented in formulas using the letter V.
    • Energy Types
      • Voltage is a method of producing electrical energy from another energy type.
      • Types of energy:
      • - Friction - Light
      • - Magnetism - Heat
      • - Chemical - Pressure
    • Increasing Voltage Using Cells & Batteries
      • When batteries are connected in a series format the voltage in the circuit is increased.
      • The current in the circuit will pass through all the batteries as they are connected in series.
      • By connecting the batteries in series form you increase the total voltage. A higher voltage means the component/ device will have a stronger output. Ex. A light would be brighter.
      • I T = I 1 = I 2 = I 3
      • E T = E 1 + E 2 + E 3
    • Increasing Current using Cells & Batteries
      • When batteries are connected in a parallel format the current in the circuit is increased.
      • The total voltage in the circuit remains the same.
      • By connecting the batteries in parallel form you increase the length of time the circuit will function. The circuit will use the power one at a time rather than as a combined force.
      • I T = I 1 + I 2 + I 3
      • E T = E 1 = E 2 = E 3
    • Calculations
      • For each of the circuits below calculate the total voltage.
      • Each battery is 1.5 V.
      E T = E 1 = E 2 = E 3 E T = 1.5 V = 1.5 V = 1.5 V E T = 1.5 V E T = E 1 + E 2 + E 3 E T = 1.5 V + 1.5 V + 1.5 V E T = 4.5 V
    • Increasing Current and Voltage
      • To get both an increase in the current and the voltage, cells or batteries would have to be connected in both series and parallel format.
    • Power Power is the amount of energy used when a circuit is complete, in operation. Power can be calculated for time periods: watts per seconds or watts per hour. The word power is represented in formulas using the letter P. Power is measured in watts. Components in a circuit either consume, transfer, store, or transform power to another energy form. - Resistive components consume power. - Conductors transfer power. - Cells and capacitors store power. - Speakers, LEDs, and motors transform power.
    • Calculating Power
      • Power consumption can be calculated for an entire circuit or at each component in a circuit.
      • Formula: P = IE
      • What is the total power consumption for the circuit below?
      • Diagram: 9V, 3A
      • Determine the voltage if a circuit has 75 watts of power and a current of 15 amps.
      • What is the required current for a 60 watts, 20 volt electrical device?
    • Answers to Power Questions I = 3A E = 5V P = 27 watts I = 60 watts / 20V E = 75 watts / 15A P = 3A(9V) I = P/E E = P/I P = IE P = 60 watts I = ? E = 20V P = 75 watts I = 15A E = ? P = ? I = 3A E = 9V
    • Assignments
      • KSB : Current, Voltage and Power
      • Textbook Reading and Questions:
      • Read chapters 2,3,7, (pages 9-29, 70-71).
      • Questions listed in KSB Activity Directions.
      • Journal Activity :
      • Electronics Web Site Reference Chart – One web site that deals with current, voltage and power.
      Click on home section. Content for all levels. Little bit of everything DC circuits. Excellent. All Grades http://www.ndt-ed.org/EducationResources/HighSchool/Electricity/hs_elec_index.htm Content Grades Web Site
    • Image Bibliography
      • Slide 3:
      • www.discover.edventures.com
      • Slide 4:
      • www.why files .larc.nasa.gov/text/kids/Problem_Board/problems/electricity/ circuits 2.html
      • Slide 7:
      • www.SolarSam.com
      • Slide 8:
      • http://www.sln.org/guide/hughes/10types/typesmagnetic.html
      • http://www.sln.org/guide/hughes/10types/typeslight.html
      • Slide 9:
      • www.iss.cet.edu
      • Slide 10:
      • www.pzweb.harvard.edu
      • Slide 11:
      • Created using PCB123 Schematic Version 2.1.0.600
      • Slide 12:
      • Created using PCB123 Schematic Version 2.1.0.600
      • Slide 13:
      • http:// www.gifanimations.com/action/ImageDisplay?group =1&category=23&index=48&dir=stay