L04 Circuit Design - EE 40 Circuit Design EE 40 Lecture 4:...

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Unformatted text preview: EE 40 Circuit Design EE 40 Lecture 4: Circuit Design 1 Resistive Circuits Almost infinite supply of homework and exam problems. Thats not why we learn this stuff. What can we build with these? EE 40 Lecture 4: Circuit Design 2 Strain Gage What about designing one of these: EE 40 Lecture 4: Circuit Design 3 How? With resistors Resistivity EE 40 Lecture 4: Circuit Design 4 http://en.wikipedia.org/wiki/Resistivity = Like a pipe or tunnel: Material Resistivity r [ W m] Type Silver 1.59 x 10-8 conductor Copper 1.72 x 10-8 Gold 2.44 x 10-8 Aluminum 2.82 x 10-8 Platinum 10.60 x 10-8 Silicon* 6.4 x 10 +2 semiconductor Teflon 10 +22 10 +24 insulator * adjustable (depends on doping, ) Resistor as Sensor??? What happens if we pull on it? Length l Cross section A = How much? = no pull + increase = ?? gage factor 2 strain In practice: , (useful to remember) EE 40 Lecture 4: Circuit Design 5 Strain Sensor...
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L04 Circuit Design - EE 40 Circuit Design EE 40 Lecture 4:...

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