Physics summary
Abbreviations
J = Joule (electrical energy)
W = Watt (Joules per second) (Electrical capacity)
KWh = Kilowatt Hour
C = Coulomb (Amperage) (Lading in joules)
A = Ampère (Coulomb per second)
V = Volt (tension) (1V = 1J/C)
R = resistance (Ω)
N = Efficiency
E = Resistivity (1,6010-19)
Formulas
E = p x t
η = (E useful / E in) x 100
(P useful / P in) x 100
P = U x I
I = Q / T
U = ∆E / Q
U = I x R
ρ = R x A / L
R = ρ x L / A
Parallel
U total = U1 = U2 = …
I total = I1 + I2 + …
1 / R total = 1 / R1 + 1 / R2
Serie
I total = I1 = I2
U total = U1 + U2 + …
R total = R1 + R2 + ….
U total = I total x R total
E = joules
P = Watt/ joules per second
T = second
U = tension in volt
I = Amperage
Q = charge in coulomb
∆E = Energy joules
R = Resistance (Ω)
ρ = resistivity (Ω x M)
L = length wire (M)
A = Surface (M2)
Diameter / 2
Radius2 X π
NTC T↑ then R↓
PTC T↑ then R↑
LDR light sensitive
T = temperature
R = Resistance Ω
Meer resistance = More light