Previously we studied the basic current divider rule along with formulas and examples. In this formula sheet, you'll learn other equations and all formulas for the cdr rule.

Let's directly move to current divider formula sheet:

General Current divider formula | |
---|---|

For current across unknown resistor | I_{x} =
R * I_{t}
/
R_{x}_{t} |

Current divider formula for 2 Resistors | |
---|---|

For current across first one | I_{1} =
R * I_{t}
/
R_{1}_{t} |

For current across second one | I_{2} =
R * I_{t}
/
R_{2}_{t} |

Alternative CDR Equation for 2 Resistors | |
---|---|

For current across first one | I_{1} =
R * I_{2}
/
R_{1} + R_{2}_{t} |

For current across second one | I_{2} =
R * I_{1}
/
R_{1} + R_{2}_{t} |

CDR Formula for 3 Resistors | |
---|---|

For current across first one | I_{1} =
R * I_{t}
/
R_{1}_{t} |

For current across second one | I_{2} =
R * I_{t}
/
R_{2}_{t} |

To current across third resistor | I_{3} =
R * I_{t}
/
R_{3}_{t} |

Where in above equation:
1
/
R = _{t}
1
/
R + _{1}
1
/
R + _{2}
1
/
R _{2} |

While solving the current divider example problem someone might confuse the general formulas for CDR and alternative forms However both these formulas are actually same. We can easily obtain:

I1 = (R2/(R1 + R2)) * It from I1 = (Rt/R1) * It

Just replace Rt by (R1.R2 / (R1 + R2)).

So that was all equations which you should remember while doing CDR.