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Multiple conversions
To convert from Watt-second (Ws) to Watt-minute (Wm), use the following formula:
Watt-minute (Wm)
= 160× Watt-second (Ws)
= 0.016666666666666666667× Watt-second (Ws)
To convert from Watt-second (Ws) to Watt-hour (Wh), use the following formula:
Watt-hour (Wh)
= 160 × 60× Watt-second (Ws)
= 0.00027777777777777777778× Watt-second (Ws)
To convert from Watt-second (Ws) to Milliwatt-hour (mWh), use the following formula:
Milliwatt-hour (mWh)
= 13.6× Watt-second (Ws)
= 0.27777777777777777778× Watt-second (Ws)
To convert from Watt-second (Ws) to Kilowatt-hour (kWh), use the following formula:
Kilowatt-hour (kWh)
= 160 × 60 × 1000× Watt-second (Ws)
= 2.7777777777777777778× 10-7× Watt-second (Ws)
To convert from Watt-second (Ws) to Megawatt-hour (MWh), use the following formula:
Megawatt-hour (MWh)
= 160 × 60 × 106× Watt-second (Ws)
= 2.7777777777777777778× 10-10× Watt-second (Ws)
To convert from Watt-second (Ws) to Gigawatt-hour (GWh), use the following formula:
Gigawatt-hour (GWh)
= 160 × 60 × 109× Watt-second (Ws)
= 2.7777777777777777778× 10-13× Watt-second (Ws)
To convert from Watt-second (Ws) to Joule (J), use the following formula:
Joule (J)
1
To convert from Watt-second (Ws) to Kilojoule (kJ), use the following formula:
Kilojoule (kJ)
= 11000× Watt-second (Ws)
= 0.001× Watt-second (Ws)
To convert from Watt-second (Ws) to Megajoule (MJ), use the following formula:
Megajoule (MJ)
= 1106× Watt-second (Ws)
= 10-6× Watt-second (Ws)
To convert from Watt-second (Ws) to Gigajoule (GJ), use the following formula:
Gigajoule (GJ)
= 1109× Watt-second (Ws)
= 10-9× Watt-second (Ws)
To convert from Watt-second (Ws) to calorie (cal), use the following formula:
calorie (cal)
= 14.184× Watt-second (Ws)
= 0.23900573613766730402× Watt-second (Ws)
With 14.184 is the ratio between the base units calorie (cal) and Joule (J).
To convert from Watt-second (Ws) to Kilocalorie (kcal), use the following formula:
Kilocalorie (kcal)
= 14.184 × 11000× Watt-second (Ws)
= 0.00023900573613766730402× Watt-second (Ws)
With 14.184 is the ratio between the base units calorie (cal) and Joule (J).
A Watt-second (Ws) is a unit of energy in the International System of Units (SI), equal to exactly one Joule (J).
It is a fundamental measurement used to quantify energy transfer, especially in fields like physics and photography.
The relationship is simple: one Watt-second is precisely equal to one Joule.
This 1:1 equivalence means the two units are entirely interchangeable. So, if you have 100 Ws of energy, you also have 100 J of energy.
This makes it a straightforward and reliable unit for any precise energy calculation.
In photography, the Watt-second is the standard for measuring the maximum energy output of a studio strobe or electronic camera flash.
Essentially, a higher Watt-second rating means a more powerful flash.
For example, a 500 Ws strobe has more flash power than a 200 Ws unit, allowing it to produce a much brighter burst of light.
This extra power is crucial for illuminating larger scenes or overpowering ambient light, like bright sunshine.
The name "Watt-second" perfectly describes its own formula.
It is the amount of energy used when one Watt of power is applied for exactly one second.
This gives us the fundamental equation for energy transfer:
Energy (Ws) = Power (W) × Time (s)
To sum up, while the Watt-second is a universal unit of energy equivalent to a Joule, its most common practical use is in photography.
When choosing a studio strobe or camera flash, a higher Ws rating gives you more lighting power, offering greater creative control over your shots.