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L17_Viet_Grounding_RC Circuits

L17_Viet_Grounding_RC Circuits - Physics 122 Electricity...

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Physics 122 Electricity and Magnetism Lecture 16 Grounding, RC Circuits

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05/12/09 Physics 122 - Lecture 17 2 Example : Analyzing a Complex Circuit (2)
05/12/09 Physics 122 - Lecture 17 3 Maximum Power Transfer E r R Question: For a battery with EMF E and internal resistance r , what value should an adjustable external load resistance R have to make the power dissipated in R as large as possible? I r R = + E ( 29 2 2 2 2 R R P I R R r R r R = = = + + E E ( 29 ( 29 ( 29 2 2 2 2 3 3 2 0 R dP R r R dR r R r R r R - = - = = + + + E E E P R is a maximum when r-R = 0 or r=R . In other words, energy can be drawn from the battery at the greatest rate when the external load resistance matches the internal resistance of the battery. This is called load matching . It is very important in transferring energy and signals with minimum loss. But note that only ½ of the energy gets to R. I

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05/12/09 Physics 122 - Lecture 17 4 Grounding and GFI Modern power wiring includes a “ground” line, the round 3 rd wire of an electrical plug. The ground point defines a point of zero potential,
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L17_Viet_Grounding_RC Circuits - Physics 122 Electricity...

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