Electric Series Circuits Calculations

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

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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

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Ohm Laws 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

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Ohm Law Solution

• Rt R1 R2
• Rt 15 W 5 W
• VI R
• 20 v I (20 W)
• 1A I

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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

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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