current electricity Flashcards
formulae + definitions
1
Q
current formula
A
I = Q / ∆t
Current = rate of flow of charges
Q = Charge
t = time
2
Q
what is ohm’s law
A
law of resistance
R = V / I
3
Q
resistance formula
A
R = V / I
V = IR
V = voltage
R = resistance
I = current
4
Q
Resistance of a wire formula
A
R = ρL/A
ρ = resistivity
L = length of wire
A = cross sectional area
4
Q
what is current electricity
A
This is the study of
electric charges in motion.
4
Q
what is charge?
A
5
Q
A
5
Q
A
6
Q
A
7
Q
A
8
Q
A
