The formula for watts (W) is:
\[
P = V \times I
\]
Where:
- **P** is the power in watts (W),
- **V** is the voltage in volts (V),
- **I** is the current in amperes (A).
This formula is used to calculate the electrical power in a circuit. It shows how much power is consumed or produced by an electrical device based on the voltage across it and the current flowing through it.