The Energy Input Calculator helps you measure how much energy a system consumes during a specific period. It works for different types of systems—electrical, mechanical, or thermal—and gives results in joules. You can use this tool to evaluate machine efficiency, understand power consumption, or manage energy costs in various applications like electronics, heating, and motors.
This calculator belongs to the Energy Measurement and Conversion category.
Formula of Energy Input Calculator
1. General Energy Input Formula:
Energy Input = Power × Time
Where:
- Power is measured in watts (W)
- Time is measured in seconds (s)
- Energy Input is the total energy in joules (J)
2. Electrical Systems:
Energy Input = Voltage × Current × Time
Where:
- Voltage (V) = Electric potential (volts)
- Current (I) = Flow of electric charge (amperes)
- Time (t) = Duration of operation (seconds)
- Result is in joules (J)
3. Thermal Systems:
Energy Input = Mass × Specific Heat Capacity × Temperature Change
E = m × c × ΔT
Where:
- m = Mass of the substance (kg)
- c = Specific heat capacity (e.g., 4186 J/kg·°C for water)
- ΔT = Change in temperature (°C)
- E = Energy required to heat the material (joules)
These formulas let you calculate how much energy is needed or consumed in different systems depending on the type of input and context.
Quick Reference Table
| System Type | Input Variables Needed | Formula Used |
|---|---|---|
| General | Power (W), Time (s) | Power × Time |
| Electrical | Voltage (V), Current (A), Time (s) | Voltage × Current × Time |
| Thermal | Mass (kg), Heat Capacity, ΔT (°C) | Mass × Heat Capacity × ΔT |
This table is helpful when you want to choose the correct formula for your situation.
Example of Energy Input Calculator
Imagine a 100-watt light bulb running for 3 hours. First, convert hours into seconds:
3 hours = 3 × 3600 = 10800 seconds
Apply the formula:
Energy Input = Power × Time = 100 × 10800 = 1,080,000 joules
So, the bulb uses 1.08 million joules of energy.
Most Common FAQs
It uses joules (J) in all cases, unless converted.
Yes, if you know the voltage, current, and how long it runs, you can calculate energy used.
It is 4186 J/kg·°C—used in thermal system calculations.