Electrical resistance
- Resistance is the opposition to the flow of current.
- The symbol for resistance is R.
- The unit of resistance is the ohm (\Omega).
- A larger resistance means a smaller current for a given potential difference.
- It also transfers electrical energy into other forms (usually heat).
Resistance equation
\text{resistance} = \frac{\text{voltage}}{\text{current}}
R=\frac{V}{I}
| Question | Answer |
|---|
| What is resistance? | The opposition to the flow of current. |
| What is the symbol for resistance? | R |
| What is the unit of resistance? | The ohm (\Omega). |
| What happens to current when resistance is larger for a given potential difference? | A smaller current flows. |
| What does resistance transfer electrical energy into? | Other forms (usually heat). |
| What is the equation for resistance in terms of voltage and current? | \text{resistance} = \frac{\text{voltage}}{\text{current}} or R = \frac{V}{I} |