Summary of the 4 main quantities
Summary of the 4 main quantities
There are four main quantities we need to think about when working with electrical circuits.
These are explained much more over the next few pages, but here is a summary:
| Quantity | Symbol | Unit | Unit Symbol | Definition |
|---|---|---|---|---|
| Charge | Coulomb | $1C = | ||
| Current | Ampere | Rate of flow of charge | ||
| Potential difference | Volt | work done per coulomb charge | ||
| Resistance | Ohm | Opposition to current flow, ratio of p.d. to current |