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Energy Usage Formula:
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Energy usage calculation helps determine the amount of electrical energy consumed by an appliance or device over a specific period. It's measured in kilowatt-hours (kWh), which is the standard unit for electricity billing in the UK.
The calculator uses the energy usage formula:
Where:
Explanation: The formula converts watts to kilowatts (dividing by 1000) and multiplies by the number of hours to get the total energy consumption in kWh.
Details: Calculating energy usage helps consumers understand their electricity consumption patterns, estimate electricity costs, identify energy-efficient appliances, and make informed decisions to reduce energy bills and environmental impact.
Tips: Enter the power consumption of your appliance in watts and the number of hours it's used. Both values must be positive numbers. The calculator will provide the energy consumption in kilowatt-hours (kWh).
Q1: How do I find the power rating of my appliance?
A: Check the manufacturer's label, user manual, or specification sheet. Most appliances display their power consumption in watts (W) or kilowatts (kW).
Q2: What's the average electricity cost per kWh in the UK?
A: As of 2024, the average electricity price in the UK is around 24-30 pence per kWh, but this varies by supplier and tariff.
Q3: How can I reduce my energy consumption?
A: Use energy-efficient appliances, turn off devices when not in use, use timers, and consider energy-saving modes on electronic devices.
Q4: What's the difference between watts and kilowatt-hours?
A: Watts measure power (rate of energy use), while kilowatt-hours measure energy consumption (power × time).
Q5: Should I use this calculator for all electrical devices?
A: This calculator works for most electrical appliances, but for devices with variable power consumption, you may need to calculate average usage.