# Intro

The *watt* (W) is a convenience unit to describe the amount of work that current can do, as a factor of voltage and amperage, and is defined as:

```
Watts = Volts * Amps
```

## Common Wattages

Electrical Current | Voltage | Amperage | Wattage |
---|---|---|---|

Hair Dryer | 117V | 12A | 1,404W |

60 Watt Incandescent Light Bulb | 117V | ~0.5A | ~60W |

iPad/Tablet Charger | 5V | ~2A | 10W |

Netduino | 5V | 40mA | 0.2W |

# Further Reading

For a much more in depth discussion regarding amps, see the wattage section in Part 2 of the Electronics Tutorial