35 Watts to Joules
Watts measure power and joules measure energy, so the answer depends on time. Here is what a 35 W device uses over each period.
35 J per second
Because 1 watt = 1 joule per second, 35 W delivers 35 J every second it runs.
- Per minute
- 2,100 J
- Per hour
- 126,000 J
- Per hour (kWh)
- 0.035 kWh
- Per day
- 3,024,000 J
35 watts to joules, explained
A watt is a rate: one watt means one joule of energy is used every second. So 35 watts means 35 joules per second. To get a total number of joules you multiply by how long the power runs.
For example, a 35 W device left on for one hour uses 35 × 3,600 = 126,000 J. Over a full day it uses 3,024,000 J. On an electricity bill, one hour of use is 0.035 kWh.
35 W draws about 58% of the power of an old-style 60 W incandescent bulb. One hour at 35 W consumes 0.035 kWh of electricity — about 0.53¢ at a US average residential rate of $0.15 per kWh.
joules = 35 W × time in secondsChromebook laptop (35 W)
A lightweight school Chromebook draws about 35 watts of power under moderate CPU loads.
Electrical Power Comparison Scale
Need a different power or time? Use the interactive converter below for any combination.
35 W energy over time
| Time on | Energy (joules) |
|---|---|
| 1 second | 35 J |
| 1 minute | 2,100 J |
| 10 minutes | 21,000 J |
| 1 hour | 126,000 J |
| 6 hours | 756,000 J |
| 1 day | 3,024,000 J |
Convert any wattage and time
The full Watts to Joules converter handles W, kW, MW, any time unit, and the reverse joules→watts and time calculations.
FAQ: 35 watts
How many joules is 35 watts?
35 watts is not a fixed number of joules on its own — watts measure power and joules measure energy, so you need a time. A 35 W device uses 35 J every second, 126,000 J over one hour (0.035 kWh).
How do you convert 35 watts to joules?
Multiply 35 by the number of seconds the power runs. Joules = 35 × time in seconds. For one hour that is 35 × 3,600 = 126,000 J.
How much energy does a 35 W device use per hour?
A 35 W device running for one hour uses 126,000 J, which is 0.035 kWh on an electricity bill.