Unit 9 Electricity

Current: r__ of f__ of e__ c__ past a p__

rate, flow, electric charge, point

Current equation

I = Q/t

Equation for current using charge carriers

I = nevA

Potential difference: e__ t__ p__ u__ c__ f__ f__ _ p__ t_ a__

energy transferred per unit charge flowing from 1 point to another

pd energy transfer: e__ to o__ e.g. t__

electrical, other, thermal

p.d. formula w/ energy transferred

V = W/Q

Power formula w/ volt

P = IV

Resistance: o__ t_ c__

opposition to current

Ohm’s equation

V = IR

what is ts

metal wire at const temp

what is ts

filament lamp

what is ts

diode

↑current of f__ lamp = ↑r__ bc ↑t__

↑light intensity = ↓r__ of light-dependent resistor (LDR)

↑temp. = ↓resistance of t__

filament, resistance, temp, resistance, thermistor

Ohm’s law: f__ _ c__ a_ c__ t__, c__ i_ p__ t_ p_ a__ i_

for a conductor at const temp, current is proportional to pd across it

Resistivity formula (use resistance)

R = pL/A