Watt-seconds to calories conversion

How to convert watt-seconds to calories?

Certainly! To convert watt-seconds (Ws) to calories, you can use the following conversion factors: 1 watt-second is equal to 1 joule. 1 calorie (small calorie, or gram calorie, cal) is approximately equal to 4.184 joules.

Therefore, to convert 1 watt-second to calories, you can use:

$\text{1 watt-second} = \text{1 joule} \times \frac{1 \text{calorie}}{4.184 \text{joules}} \approx 0.239 \text{calories}$

So, 1 watt-second is approximately equal to 0.239 calories.

Real-world Examples for Other Quantities of Watt-Seconds:

1. LED Light Bulb:

   • A 10-watt LED bulb running for 1 second uses 10 watt-seconds of energy.
   • Converting to calories: $10 \, \text{watt-seconds} \times 0.239 \, \text{calories/watt-second} \approx 2.39 \, \text{calories}$

2. Smart Phone Battery:

   • A typical smartphone might use around 2 watts when in use.
   • For example, if you're using the phone for 1 hour (3600 seconds): $2 \, \text{watts} \times 3600 \, \text{seconds} = 7200 \, \text{watt-seconds}$
   • Converting to calories: 7200 \, \text{watt-seconds} \times 0.239 \, \text{calories/watt-second} \approx 1721 \. \text{calories}

3. Household Iron:

   • An iron might use around 1000 watts.
   • If the iron is used for 10 minutes (600 seconds): $1000 \, \text{watts} \times 600 \, \text{seconds} = 600,000 \, \text{watt-seconds} = 600 \, \text{kJ}$
   • Converting to calories: $600,000 \, \text{watt-seconds} \times 0.239 \, \text{calories/watt-second} \approx 143,400 \, \text{calories}$

These examples illustrate how energy in watt-seconds can be converted to calories and how various devices and appliances consume energy.