Calculate seconds from joules only when power is known, or solve energy or power with J, kJ, Wh, kWh, W, kW, hp, time units, efficiency, and sensitivity results.
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Joules To Seconds Formula
The following formula uses delivered energy and delivered power. With source power and efficiency η, use T = E / (Psource × η).
Variables:
- T is the time in seconds (s)
- E is the total energy in joules (J)
- P is constant or average delivered power in watts (W) over the same interval
Divide delivered energy in joules by delivered power in watts. For source power, multiply by the delivered-power efficiency first. A watt equals one joule per second; the table below assumes 100% efficiency.
| Energy (J) | Power (W) | Time (s) |
|---|---|---|
| 10 | 9 | 1.111 |
| 100 | 9 | 11.111 |
| 1000 | 9 | 111.111 |
| 3600 | 9 | 400.000 |
| 10 | 18 | 0.556 |
| 100 | 18 | 5.556 |
| 1000 | 18 | 55.556 |
| 3600 | 18 | 200.000 |
| 10 | 60 | 0.167 |
| 100 | 60 | 1.667 |
| 1000 | 60 | 16.667 |
| 3600 | 60 | 60.000 |
| 10 | 65 | 0.154 |
| 100 | 65 | 1.538 |
| 1000 | 65 | 15.385 |
| 3600 | 65 | 55.385 |
| 10 | 1000 | 0.010 |
| 100 | 1000 | 0.100 |
| 1000 | 1000 | 1.000 |
| 3600 | 1000 | 3.600 |
| Formula: t = E / P. Examples use common power levels (9 W LED, 18 W fast charger, 60–65 W laptop/lighting, 1000 W microwave). Note: 1 Wh = 3600 J. | ||
What Does “Joules to Seconds” Mean?
Joules and seconds are units of measurement for two different physical quantities – energy and time respectively. Therefore, a direct conversion from joules to seconds is not possible as they measure different things. However, in certain physics equations, such as those involving power (which is energy divided by time), these units may interact. For example, if you know the power of a certain process in watts (which is joules per second), and you know the total energy in joules, you could calculate the time in seconds. But there isn’t a direct “Joules to seconds” conversion.
How to Calculate Joules To Seconds?
The following steps outline how to calculate the Joules To Seconds using the formula T = E / P.
- First, determine the total energy in joules (E).
- Next, determine the power in watts (P).
- Next, gather the formula from above = T = E / P.
- Finally, calculate the time in seconds (T).
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
total energy in joules (E) = 500
power in watts (P) = 50
