electricity/electric current Flashcards
what is divided in a parallel circuit
current
what is divided in a series circuit
voltage
current=
voltage/resistance
volts=
joules/coulomb
electric field, E=
(force, N/(Coulomb, C) or volts/meter
coulombs law: force between two charged objects, F=
k(q1 x q2)/d^2 ; k is constant of 9.0x10^9
good conductors have…
1 or more valance electrons not anchored to nuclei
good insulators have…
no freely moveable valance electrons
define semiconductor
can act as an insulator or conductor
transistors are…
thin layers of semiconductors sandwiched together
superconductors are
materials with zero resistance (generally are cooled material)
friction charging?
electrons are rubbed off onto a new material
contact charging?
(-) rod touches neutral material, transferring electrons
amps =
coulombs/sec
Watts(power) =
Volts x Amps
