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Samenvatting Systematische Natuurkunde vwo 4 H5
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Samenvatting Systematische Natuurkunde vwo 4 H5
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NATUURKUNDE H55.1 ELEKTRISCHE STROOM EN SPANNING
- elektrische stroom: verplaatsing van lading
- richting elektrische stroom: van de positieve pool van de spanningsbron, door de
rest van de stroomkring, naar de negatieve pool (plus naar min)
- Spanningsbron: batterij, zonnecel, accu etc
Formules 5.1 uitleg
I=Q/t I = elektrische stroomsterkte in A
Q= hoeveelheid lading die de
dwarsdoorsnede van de draad
passeert in C
t = tijd waarin dat gebeurt is
U = spanning in volt
U= △E / Q △E = meegeven elektrische energie J
Q = lading in C
5.2 WEERSTAND GELEIDBAARHEID EN DE WET VAN OHM
- Geleiders: materialen waardoor lading zich goed kan verplaatsen
- Isolatoren: materialen waardoor lading zich nauwelijks kan verplaatsen
Formules 5.2 uitleg
G=1/R G= geleidbaarheid
R = weerstand in Ω
ρ = (R x A) / l ρ = soortelijke warmte in Ωm
R = weerstand in Ω
l = lengte in m
A = dwarsdoorsnede in m2
I=GxU I = stroomsterkte in A
U=IxR G = Geleidbaarheid in S
U = spanning in V
R = weerstand in Ω
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