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* A very powerful concept is the voltage divider, it allows us to attenuate (but not amplify!) any voltage in any circuit | * A very powerful concept is the voltage divider, it allows us to attenuate (but not amplify!) any voltage in any circuit | ||
[http://tinyurl.com/yxhsk8sc voltage divider with even resistors] | [http://tinyurl.com/yxhsk8sc voltage divider with even resistors] | ||
* The capacitor is an inportant building block, which can store charge over a given amount of time. | |||
[http://www.falstad.com/circuit/circuitjs.html?cct=$+1+0.000005+10.20027730826997+50+5+43%0Av+-112+16+-112+-64+0+2+10+5+0+0+0.5%0Ax+-208+68+64+71+4+12+Capacitors%5Csstore%5Cscharge%5Csover%5Csa%5Cscertain%5Cstime%5Csspan.%5Cs%0Ax+-95+-157+0+-154+4+20+Capacitors%0Aw+-208+16+-112+16+0%0Aw+-112+16+32+16+0%0Ar+32+16+32+-64+0+1000%0Ac+-112+-64+32+-64+0+0.000002+-4.9914229719235905%0Ap+96+-64+96+16+1+0%0Aw+32+-64+96+-64+0%0Aw+32+16+96+16+0%0Ap+-208+-64+-208+16+1+0%0Aw+-208+-64+-112+-64+0%0Ax+-208+142+189+145+4+12+In%5Csa%5Csreal-world%5Csscenario%5Csthey%5Cswill%5Csalways%5Csdischarge%5Csbecause%5Csof%5Csleackage.%5Cs%0Ax+-209+93+221+96+4+12+The%5Csamount%5Csof%5Cscharge,%5Csthey%5Cscan%5Cshold,%5Csdepends%5Cson%5Cstheir%5Cssize%5Csgiven%5Csin%5CsFarads%5Cs(F).%0Ax+-209+116+188+119+4+12+The%5Csbigger%5Cstheir%5Cscapacity%5Cs(F),%5Csthe%5Cslonger%5Csthey%5Csneed%5Csto%5Cscharge%5Csor%5Csdischarge.%0Ax+-208+171+287+174+4+12+In%5Csa%5Cscircuit%5Cstheir%5Cscharge%5Csand%5Csdischarge%5Cstimes%5Csare%5Cscontrolled%5Cswith%5Csa%5Csseries%5Csor%5Csparallel%5Csresistor.%0Ao+10+8+0+4098+5+0.1+0+1%0Ao+6+8+0+4098+5+0.1+1+2+6+3%0Ao+7+8+0+4098+10+0.1+2+1%0A Capacitors] | |||
* In printed electronics, we use capacitors to detect the presence of fingers by a change in capacitance | |||