The formula to calculate the Brush Power Drop is:

\[ P_{BD} = I_a \cdot V_{BD} \]

Brush Power Drop refers to the power that is lost due to the voltage developed across the brushes and the commutator as the electrical current passes through them. Armature Current is defined as the current developed in the armature of an electrical DC generator due to the movement of the rotor. Brush Voltage Drop refers to the voltage that is lost across the brushes and the commutator as the electrical current passes through them.

Let's assume the following values:

- Armature Current (Ia) = 0.75 A
- Brush Voltage Drop (VBD) = 5.85 V

Using the formula:

\[ P_{BD} = 0.75 \cdot 5.85 = 4.3875 \]

Armature Current (Ia) | Brush Voltage Drop (VBD) | Brush Power Drop (PBD) |
---|---|---|

0.5 | 5.85 | 2.925000000000000 |

0.6 | 5.85 | 3.510000000000000 |

0.7 | 5.85 | 4.095000000000000 |

0.8 | 5.85 | 4.680000000000000 |

0.9 | 5.85 | 5.264999999999999 |

1 | 5.85 | 5.849999999999999 |