You’re confusing Watts (power) with Watt-hours (energy). A Watt is a Joule per second. A Watt-hour is the amount of energy you’d use if you used 1 Watt for an hour i.e. 3600 Joules.
Microwaves use around 1000 watts. If you ran a microwave for an hour, it would use 1000 Watt-hours (aka 1 kilowatt-hour (kWh))
You’re confusing Watts (power) with Watt-hours (energy). A Watt is a Joule per second. A Watt-hour is the amount of energy you’d use if you used 1 Watt for an hour i.e. 3600 Joules.
Microwaves use around 1000 watts. If you ran a microwave for an hour, it would use 1000 Watt-hours (aka 1 kilowatt-hour (kWh))