Energy Converter

Convert between Joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, and electronvolts instantly.

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What is an Energy Calculator?

An Energy Calculator is a tool that helps you calculate and convert energy between units such as joules, calories, kilowatt-hours, and BTUs. It can also be used to estimate appliance energy consumption and electricity costs.

How to Use

To use an energy calculator:

  1. Enter the value you want to calculate or convert
  2. Select the input unit (e.g., joules, calories, kWh)
  3. Choose the target unit for conversion
  4. For electricity usage, input power (watts), time (hours), and cost per kWh to estimate expenses

Common Energy Units

Most energy calculators support these units:

  1. Joule (J)
  2. Calorie (cal) and Kilocalorie (kcal)
  3. Kilowatt-hour (kWh)
  4. British Thermal Unit (BTU)
  5. Electronvolt (eV)

Applications of an Energy Calculator

Energy calculators are commonly used for:

  1. Converting energy values between different units
  2. Estimating electricity bills based on appliance usage
  3. Studying physics and thermodynamics problems
  4. Engineering and industrial energy management

Limitations of Energy Calculators

Some limitations to keep in mind:

  1. Accuracy depends on correct input values
  2. Real-world factors like appliance efficiency and energy losses are not always considered
  3. Some tools may not support less common energy units

Conversion Formula

Energy Conversions

1 calorie (cal) = 4.184 joules (J)
1 kilocalorie (kcal) = 4184 J
1 kilowatt-hour (kWh) = 3.6 × 10⁶ J
1 BTU ≈ 1055 J
1 electronvolt (eV) = 1.602 × 10⁻¹⁹ J

Example

Energy Converter

An energy converter allows you to convert between different units of energy, such as joules (J), calories (cal), kilowatt-hours (kWh), and electronvolts (eV).
Common conversions:
1 cal = 4.184 J
1 kWh = 3.6 × 10⁶ J

Real-Life Example

A person burns energy by running and wants to know how much it equals in different units:

  • Energy burned: 500 kcal
  • Convert to joules: 500 × 4,184 ≈ 2,092,000 J
  • Convert to kilowatt-hours: 2,092,000 ÷ 3,600,000 ≈ 0.58 kWh

Key Insight

Energy conversion helps understand energy consumption or expenditure in different contexts. Burning 500 kcal while running is equivalent to about 2.09 million joules or 0.58 kWh.

Frequently Asked Questions

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