EE302Lecture7 - Review Resistors In Series Review Resistors...

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Review - Resistors In Series: Review - Resistors In Parallel: For two resistors in parallel: 1
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Where V T  is the total  voltage across the series  combination. The Voltage Divider When resistors are in series, the total voltage across the series  combination is divided  across  the individual resistors. V T  = V 1  + V 2  + V 3  = IR 1  + IR 2  + IR 3 V T  = I (R 1  + R 2  + R 3 ) I = V T / (R 1  + R 2  + R 3 ) = V T /R eq V 1  = IR 1  = V T  [R 1 /(R 1  + R 2  + R 3 )] V 2  = IR 2  = V T  [R 2 /(R 1  + R 2  + R 3 )] V 3  = IR 3  = V T  [R 3 /(R 1  + R 2  + R 3 )] Example for  R 1 =7  R 2 =3  R 3 =2 ohms, what is the voltage across R 2  when  V T =24 volts?: 2
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V n  is  always  less than V T . Voltage Divider Special Cases: What happens if a current source I T  is in place of V T ? Is this still a voltage divider?    yes Because   V T  = R eq I T   However, Ohm’s Law is easier! 3
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V 2  = I S  R 2 The Current Divider The Current Divider Equation 4
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G n G eq or A Current Divider Example           I T Smaller resistors carry a larger portion of the current.
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EE302Lecture7 - Review Resistors In Series Review Resistors...

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