The unit used to measure how much power an electrical device uses — what you see on a light bulb's label.
The fundamental unit of electrical power, equal to one joule per second, representing the rate at which electrical energy is consumed or produced. Watts are calculated by multiplying voltage by current (W = V × A). Electrical equipment is rated in watts or kilowatts to indicate power consumption.
Replacing 60-watt incandescent bulbs with 9-watt LEDs reduced the lighting power density by 85%.
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