Calculating Resistance
By DarthVader
Date: 2021-11-26
Topic: 86 see comments
Post views: 1106
Resistors Connected in Series:
The combined resistance of a circuit containing x resistors connected in series, Rt, is equal to the sum of the resistances:
Rt = R1 + R2 + R3 + R4 + …… + Rx
Resistors Connected in Parallel:
The combined resistance of a circuit containing x resistors connected in parallel Rt can be calculated:
1/Rt = 1/R1 + 1/R2 + 1/R3 + 1/R4 + …….. + 1/Rx
Example:
Circuit with E.M.F 12 V, and 2 resistors in parallel with resistance 4 Ω and 6 Ω respectively:
Rt = (1/4 + 1/6)-1 = 2.4 Ω
Finding the Resistance of a Single Resistor in a Series Circuit:
As per Kirchhoff's voltage law, the amount of current flowing in each component of a series circuit is the same.
To find the current flowing through any single resistor, first calculate the Rt (total resistance of the circuit) then use Rt and the source voltage to calculate I:
I = V/R
Finding the Resistance of a Single Resistor in a Parallel Circuit:
As per Kirchhoff's current law, the sum of the currents through each branch of the parallel circuit is equal to the total current flowing through the power supply.
To find the current flowing through any single resistor, use the resistance of that specific resistor along with the source voltage to find I:
I = V/R
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