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Ohm's Law and Calculations in Electric Series Circuits

Learn about Ohm's Law and calculations in electric series circuits, including resistor values, current flow, voltage division, and resistance aspects. Understand how components like resistors, lamps, motors, heaters, speakers, and carbon paper affect circuit behavior.

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Ohm's Law and Calculations in Electric Series Circuits

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  1. Electric Series Circuits Calculations • Alexander Graham Bell constructed this prototype telephone in 1875

  2. Resistors • Lamps or bulbs (light energy) • Electric Motors ( mechanical energy) • Heaters • Speakers • Carbon Paper

  3. Ohms law • R= Resistance (control of the flow of electrons) • I = Current ( the amount of electron “flow” ) • V= Volts (the “pressure" or potential of the charges V = I R

  4. Ohm Law’s Calculation • The diagram shows two resistors connected in series to a 20.-volt battery.  If the current through the 5.0-ohm resistor is 1.0 ampere, the current through the 15.0-ohm resistor is

  5. Ohm Law Solution • Rt = R1 + R2 • Rt =15 W + 5 W • V=I R • 20 v = I (20 W) • 1A = I

  6. Voltage in a Series Circuit • The net change in voltage “around” the circuit is equal to zero • Vt = V1 + V2 + V3 + ……… • The Voltage “divider” is the resistor • V1 = I R1 , V2 = I R2, V3 = I R3 • Note: The current ( I ) is constant throughout the Series circuit

  7. Resistance in a Series Circuit • Each resistor adds to the Total resistance of the circuit (equivalent resistance) • Rt = R1 + R2 + R3 + ……… • The Voltage “divider” is the resistor • V1 = I R1 , V2 = I R2, V3 = I R3 • Note: The current ( I ) is constant throughout the Series circuit • The Amperes are constant • I = I1 = I2 = I3

  8. Summary • In a Series Circuits the amperes remain constant throughout the circuit • Resistors control the voltage and current of power sources • The Total voltage is equal to the sum of the individual voltages • The Total resistance is equal to the sum of individual resistance

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