What does 20 watts mean?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
20 watts means a device consumes or produces 20 joules of energy per second. Wattage indicates the rate of energy consumption or power output. For example:
- A 20-watt LED bulb is uite bright and energy-efficient
- A 20-watt phone charger can charge devices at a moderate speed
- Running a 20-watt device for 50 hours consumes 1 unit (kWh) of electricity
Lower wattage generally means lower electricity consumption and cost. When comparing devices, lower wattage for the same performance indicates better energy efficiency.
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