# What are resistances in parallel

R._{total} | Formula:R._{total} = R1 · R2 / (R1 + R2) |

**two**Enter resistance values, the third value of the parallel connection will be calculated.

It can also be the total resistance

*R.*

_{total}and a resistance

*R.*

_{1}or

*R.*

_{2}can be entered.

When entering a decimal, the is always

**Point**to use.

Equation or formula for calculating the parallel connection of two resistors *R.*_{1} other *R.*_{2}:

Calculation of the necessary parallel resistance *R.*_{2}, if *R.*_{1} and the total resistance *R.*_{total} given is:

Solving the formula R._{total}= (R._{1}· R._{2}) / (R._{1} + R._{2}) to R._{1}:1/ R._{total} = 1/R._{1} + 1/R._{2}R._{total}·R._{1}·R._{2}[1/R._{total} = 1/R._{1} + 1/R._{2}]R._{1}·R._{2} = R._{total}·R._{2} + R._{total}·R._{1}R._{1}·R._{2} − R._{total}·R._{1} = R._{total} · R._{2}R._{1}(R._{2} − R._{total}) = R._{2}·R._{total}Last step: R._{1} = R._{2} · R._{total} / (R._{2} − R._{total})respectively: R._{2} = R._{1} · R._{total} / (R._{1} − R._{total}) |

**Note:** Calculating the parallel resistances is exactly the same as calculating

the parallel connection of coils or the series connection of capacitors.

**• Find the resistances R._{1} and R._{2}if the total resistance is known: •**

**Calculation: resistor parallel connection by iteration****Find of R._{1} and R._{2} if the total resistance is known**

**● Calculate many parallel resistances ●**

Here you can calculate the total resistance - up to 10 resistors connected in parallel.Enter the resistance values in the fields below and when all values are entered, then click on 'Calculation'. The result is given below. As a test you can enter the values 4, 6 and 12 ohms; the result should be 2 ohms. Attention: Clearing the fields by hand does not delete the saved values. Point to use. |

**Ohm's law - Ohm's law**

**Two resistors connected in parallel and the calculated total resistance**

Resistances from 1 to 100 ohms

R2 | R1 | |||||||||||

1 | 1,5 | 2,2 | 3,3 | 4,7 | 6,8 | 10 | 15 | 22 | 33 | 47 | 68 | |

1 | 0,5 | 0,6 | 0,69 | 0,77 | 0,83 | 0,87 | 0,91 | 0,93 | 0,95 | 0,97 | 0,98 | 0,99 |

1,5 | 0,6 | 0,75 | 0,89 | 1,03 | 1,14 | 1,22 | 1,30 | 1,36 | 1,40 | 1,43 | 1,45 | 1,46 |

2,2 | 0,69 | 0,89 | 1,1 | 1,32 | 1,50 | 1,66 | 1,82 | 1,92 | 2,0 | 2,06 | 2,10 | 2,13 |

3,3 | 0,77 | 1,03 | 1,32 | 1,65 | 1,94 | 2,22 | 2,48 | 2,70 | 2,87 | 3,00 | 3,08 | 3,14 |

4,7 | 0,83 | 1,14 | 1,50 | 1,94 | 2,35 | 2,78 | 3,20 | 3,58 | 3,87 | 4,12 | 4,27 | 4,39 |

6,8 | 0,87 | 1,22 | 1,66 | 2,22 | 2,78 | 3,40 | 4,05 | 4,68 | 5,19 | 5,64 | 5,94 | 6,18 |

10 | 0,91 | 1,30 | 1,82 | 2,48 | 3,20 | 4,05 | 5,0 | 6,0 | 6,9 | 7,7 | 8,3 | 8,7 |

15 | 0,93 | 1,36 | 1,92 | 2,70 | 3,58 | 4,68 | 6,0 | 7,50 | 8,9 | 10,3 | 11,4 | 12,2 |

22 | 0,95 | 1,40 | 2,00 | 2,87 | 3,87 | 5,19 | 6,9 | 8,9 | 11,0 | 13,2 | 15,0 | 16,6 |

33 | 0,97 | 1,43 | 2,06 | 3,0 | 4,12 | 5,64 | 7,7 | 10,3 | 13,2 | 16,5 | 19,4 | 22,2 |

47 | 0,98 | 1,45 | 2,1 | 3,08 | 4,27 | 5,94 | 8,3 | 11,4 | 15,0 | 19,4 | 23,5 | 27,8 |

68 | 0,99 | 1,46 | 2,13 | 3,14 | 4,39 | 6,18 | 8,7 | 12,2 | 16,6 | 22,2 | 27,8 | 34,0 |

**Note:** This calculator can also solve other math problems.

Calculating parallel-connected resistors is exactly the same as

those for inductors connected in parallel or capacitors connected in series.

Converted power in a resistor: P. = U·I., P. = U^{2} / R., P. = I.^{2} ·R.. |

Note: For the resistors in series is the electricity the same for each resistanceand for resistors in parallel, that is tension the same for each resistor. |

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