Info:
| Weerstanden in serie | | Weerstanden parallel |
Rv = R1 + R2 + R3 + ...
I = I1 = I2 = I3 = ...
U = U1 + U2 + U3 + ... | |
| 1 | = | 1 | + | 1 | + | 1 | + ... |
| Rv | R1 | R2 | R3 |
I = I1 + I2 + I3 + ...
U = U1 = U2 = U3 = ...
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Bereken de weerstand van R2.
Gegeven is dat R1 = 90 Ω, de spanning over de spanningsbron = 37.5 V en de stroomsterkte = 1.25 A.
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Uitwerking:
| Gegeven | | Uitwerking | R1 = 90 Ω
I = 1.25 A
U = 37.5 V
Rv = U / I
R2 = ? | | Rv = U / I
Rv = 37.5 / 1.25 = 30 Ω
1/R2 = 1/Rv - 1/R1
1/R2 = 1/30 - 1/90
R2 = 1/(1/30 - 1/90) = 45 Ω |
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