A 100 watt light bulb uses 360,000 joules of energy per hour.
To understand how we calculate this, we need to know that power (in watts) is defined as energy consumed per unit time. Specifically, 1 watt is equal to 1 joule per second. Therefore, a 100 watt bulb consumes 100 joules of energy every second.
To find out how much energy it uses in an hour, we can do the following calculation:
- Number of seconds in an hour = 60 seconds/minute × 60 minutes/hour = 3600 seconds.
- Energy consumed in joules = Power (in watts) × Time (in seconds) = 100 watts × 3600 seconds = 360,000 joules.
This means that if you leave a 100 watt light bulb on for one hour, it will use up 360,000 joules of energy.