VIDEO: Calculate mixed circuit
Calculate circuits with resistors
Resistors are electronic components that can be connected either in series or in parallel. You can use certain formulas to calculate the resistance values for parallel connections as well as for series connections of resistors.
- When resistors are connected in series, for example, the individual resistance values of the components are added when calculating the total resistance. This gives you the total resistance of a series connection of resistors.
- With a parallel connection you do this a little differently. The following formula applies here to calculate the total resistance: 1 / R1 + 1 / R2 = 1 / R3.
- In an example it looks like this: R1 = 50 ohms and R2 = 100 ohms. 1/50 = 0.02 and 1/100 = 0.01. 1 / R-total would then be 0.03. If you calculate 1 / 0.03, the result is 33.33 ohms (rounded to two places). This is the total resistance.
- If several equal resistors are connected in parallel, it is easier to calculate the total resistance be carried out: Here one calculates the value of the individual resistance divided by the number of Resistances.
- Here is an example: Five individual resistors with 100 ohms each would then make up a total resistance of 20 ohms (100 divided by 5).
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You calculate a mixed circuit like this
If both types of circuit occur simultaneously in an electronic circuit, this is a mixed circuit.
- When calculating, you have to "split" the mixed circuit into series and parallel circuits, which you can then calculate individually in the manner mentioned above.
- If, for example, two resistors are in series and both are connected in parallel together with another resistor, you must First calculate the total resistance of the two resistors connected in series and this with the third resistor to calculate.
