A quantity that indicates the rate at which work is done per unit time (for example, 1 second), and is also called the power rate. In SI units, it is expressed as joules per second (J·s -1 = kg· m2 ·s -3) , called watts and using the symbol W. When electrical energy is involved, it is often called power. Watts are also used to indicate the rate at which energy is absorbed or radiated, such as the radiant energy received from the sun by a unit area of the Earth's surface. Horsepower (HP) is sometimes used as an industrial unit to indicate the power of motors, etc. 1 horsepower is 0.7355 kW. [Koide Shoichiro] [Reference] | | |Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
単位時間(たとえば1秒)にいくらの割合で仕事がなされるかを表す量で、工率ともいう。SI単位では毎秒何ジュールJ・s-1=kg・m2・s-3で表し、これをワットといい、記号Wを用いる。電気エネルギーが関係するときには電力ということが多い。ワットは、エネルギーが吸収または放射される割合を示すとき、たとえば地球表面の単位面積が太陽から受ける放射エネルギーなどにも使われる。モーターなどの仕事率を示す工業上の単位には馬力(HP)が用いられることもある。1馬力は0.7355kWである。 [小出昭一郎] [参照項目] | | |出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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