This is the 10397th most frequent Russian word.
ватт
Watt (unit of power).
Here 'ватт' is used as a measurement unit for power, specifically to describe the electrical power of the light bulb.
Мощность лампочки составляет сорок ватт.
The power of the light bulb is forty watts.
In this sentence, 'ватт' denotes the energy usage rate of the heater in terms of power consumption.
Новый обогреватель потребляет пятьсот ватт.
The new heater consumes five hundred watts.
Here 'ватт' describes the acoustic power of the sound, indicating its intensity and energy.