1. What is a Watt to kWh Calculator?

Definition: This calculator converts power consumption in watts to energy consumption in kilowatt-hours (kWh).

Purpose: It helps estimate electricity usage and costs for appliances and devices based on their power rating and operating time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( E \) — Energy in kilowatt-hours (kWh)
• \( P \) — Power in watts (W)
• \( t \) — Time in hours (h)

Explanation: The formula converts watt-hours to kilowatt-hours by dividing by 1000 (since 1 kWh = 1000 Wh).

3. Importance of Energy Calculation

Details: Understanding energy consumption helps in estimating electricity bills, comparing appliance efficiency, and managing power usage.

4. Using the Calculator

Tips: Enter the device's power rating in watts and the duration of use in hours. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Where can I find an appliance's wattage?
A: Check the label on the device, user manual, or manufacturer's specifications. Some devices list amps and volts instead (W = A × V).

Q2: How do I calculate monthly energy consumption?
A: Multiply daily kWh by number of days used per month, or calculate for typical daily usage and multiply by 30.

Q3: What's the difference between watts and kilowatt-hours?
A: Watts measure power (rate of energy use), while kWh measures total energy consumed (power × time).

Q4: How can I estimate my electricity cost from kWh?
A: Multiply kWh by your electricity rate (check your utility bill for cost per kWh).

Q5: Do appliances always use their rated wattage?
A: Some devices (like refrigerators) cycle on/off, using full power only when running. Others (like light bulbs) use constant wattage.