Energy Formula:
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Definition: This calculator converts power consumption in watts to energy usage in kilowatt-hours based on time duration.
Purpose: It helps homeowners and businesses estimate electricity consumption and costs for various electrical devices.
The calculator uses the formula:
Where:
Explanation: The power in watts is multiplied by time in hours, then divided by 1000 to convert to kilowatt-hours.
Details: Understanding energy consumption helps in estimating electricity costs, comparing appliance efficiency, and managing energy usage.
Tips: Enter the device's power consumption in watts and the duration of use in hours. All values must be > 0.
Q1: How do I find my device's wattage?
A: Check the device's label, manual, or specifications. Alternatively, use a watt meter for accurate measurement.
Q2: What's the difference between watts and kilowatt-hours?
A: Watts measure power (instantaneous rate of energy use), while kilowatt-hours measure energy (power × time).
Q3: How can I estimate my electricity cost from kWh?
A: Multiply kWh by your electricity rate (found on your utility bill, typically in $/kWh).
Q4: What's a typical wattage for household appliances?
A: LED bulb: 10W, Laptop: 50W, Refrigerator: 100-400W, Microwave: 1000W, etc.
Q5: Why divide by 1000 in the formula?
A: There are 1000 watts in a kilowatt, so we divide by 1000 to convert watt-hours to kilowatt-hours.