# Resistors

**Resistors** are electrical components that provide resistance in an electrical circuit. When resistors are arranged in series, the total resistance is the sum of all the resistors in the series. When arranged in parallel, the total resistance ($R$) is the reciprocal of the sum of one over resistors in parallel, or $R = (\sum\limits_{i} \frac{1}{R_i})^{-1}$ or $R = (1/R_1 + 1/R_2 + ...)^{-1}$.

## Video: Series Resistors

## Video: Parallel Resistors

## Broader Topics Related to Resistors (Electrical Component)

### Electrical Components

Building blocks for electrical circuits

### Resistance and Ohms

Opposition to current, measured in ohms