Metal are good conductors of electricity true or false

How does the space charge width change with forward and reverse bias? also, calculate the space charge width for a reverse bias of 4v on a silicon pn junction at t = 300k and doping concentrations of na = 5x1015cm-3 , nd = 5x 1016 cm-3 .

In science and physics what is the standard unit of measure for speed?

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?