Recent content by pj83

Thanks for your help it was very useful. Thanks :)

I worked the capacitor out to be 26.5 microfarads, inductor 21.2mH by re-arranging the reactance equations, then I made a table for the reactance values at frequencies between 100-600Hz. The closest I got to reasonace was 200 Hz with a inductive reactance of 26.6ohms and capacitive reactance of...

Homework Statement My question is a series circuit is connected to a power supply set to 300Hz. At this frequency R=30 ohms, Xc=20 ohms, XL=40 ohms. I've then to work out values of R,Xc, XL at a range of frequencys from 100-600Hz. Homework Equations Xc=2x3.14xFxC, XL=2 x 3.14 x F x L...

Yeah I suppose that's true, I've read that piezo inserts in shoes could be used for powering mobiles and the like. Could'nt the same technology collect energy from people walking on pavements in busy streets ?

I'm new to electrical engineering so this is probably a stupid question. But after reading about piezo-electricity, can it be applied to large structures, like a bridge, to generate electricity when traffic travels over it ?