1. What is an Energy Consumption Calculator?

Definition: This calculator estimates the energy consumption in kilowatt-hours (kWh) based on the power rating of an appliance and its usage time.

Purpose: It helps UK households and businesses understand their electricity usage and estimate energy costs.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy consumption (kWh)
• \( P \) — Power rating (watts)
• \( t \) — Time of usage (hours)

Explanation: The power consumption in watts is multiplied by usage time in hours, then divided by 1000 to convert to kilowatt-hours.

3. Importance of Energy Calculation

Details: Understanding energy consumption helps in budgeting electricity costs, comparing appliance efficiency, and reducing carbon footprint.

4. Using the Calculator

Tips: Enter the appliance's power rating in watts (check the label) and your estimated daily/weekly usage time in hours. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find an appliance's power rating?
A: Check the manufacturer's label, manual, or specifications - usually listed in watts (W) or kilowatts (kW).

Q2: How do I convert this to cost?
A: Multiply the kWh result by your electricity rate (typically 14-30p per kWh in the UK as of 2023).

Q3: What's a typical power rating for common appliances?
A: LED bulb: 5-10W, Laptop: 50W, Fridge: 100W, Kettle: 2000-3000W.

Q4: Should I use daily or annual hours?
A: For cost estimates, daily hours multiplied by 365 gives annual consumption. The calculator works with any time period.

Q5: Does this account for standby power?
A: No, you need to add standby consumption separately if applicable (typically 1-5W for modern appliances).