---
title: "What Are Watts?"
canonical: "https://ampstowatt.com/what-are-watts/"
author: ""
published: "2026-09-05T09:08:36+00:00"
modified: "2026-09-05T09:08:36+00:00"
language: "en-US"
site: "Ampstowatt"
description: "Watts measure electrical power — the rate energy is used or converted. Learn Watt's Law (P = I × V), examples, and how watts differ from watt-hours on…"
attribution: "Ampstowatt (https://ampstowatt.com/)"
---

# What Are Watts?

**Watts (W)** measure electrical power — how fast energy is consumed or converted into heat, light, or motion. A 1,500W space heater uses 1,500 joules of energy every second while running.

 

## Watt’s Law

 **P (watts) = I (amps) × V (volts)** 

Rearrange to find amps: **A = W ÷ V**. See [Watt’s Law explained](/watts-law-explained/) for worked examples.

 

## Watts vs Watt-Hours (kWh)

 

Watts are instantaneous power. Watt-hours measure energy over time: **Wh = W × hours**. Your utility bill charges kilowatt-hours (kWh), not watts.

 

## Typical Wattage Examples

 

| Device | Approx. Watts |
| --- | --- |
| LED bulb | 9–15 W |
| Laptop charger | 45–100 W |
| Microwave | 1,000–1,200 W |
| Electric dryer | 4,000–5,600 W |

      Hub  

## Apply This Knowledge

     **Start with the main conversion tool** 

Use these calculator pages to apply the concept to real current, voltage, watts, and power-factor problems.[Amps to Watts Calculator](/)

  [W**Amps to Watts Calculator**Main calculator hub and formula reference](/)[AC**AC Amps to Watts Calculator**Apply power factor to AC current](/ac-amps-to-watts-calculator/)[DC**DC Amps to Watts Calculator**Use the direct DC watts formula](/dc-amps-to-watts-calculator/)[A**Watts to Amps Calculator**Find current from known watts and volts](/watts-to-amps-calculator/)[FX**Amps to Watts Formula**Review the formulas behind the tools](/amps-to-watts-formula/)[TAB**Conversion Charts**Compare common amp, volt, and watt values](/conversion-charts/)[PF**Power Factor**Understand real power in AC circuits](/power-factor/)     Advertisement