ͧ俿ҵҧ ŧѧҹ俿繾ѧҹ ͹
ʧ § 繵 äԴ俨ФԴҡѧҹ俿ҷ ͧ俿ҷءԴкѧҹ俿ҷͧ 1 ˹
¡ ѧ俿 ˹ ѵ ( w ) ѧҹ俿ҷҹ
µçҡͧѴ˹繾ѧҹ俿ҷԴ
ѵ¡ ˹ ( Unit )


    㹡觾ѧҹ俿Һҹ 2 ·ѡ俿
ٹ·ѡ俿
2 ¹еҡѺἧǺ俿ҷἧǺ俿ҹԵѵѵԵѴǧ ҨԵѵѵͤǺ
ͧǧǹͧҹ

äԴҡѧ俿 Դҡ
      ѧ俿 = ѧҹ俿ҷ / ҷ
 

                    P = W / t

ѧҹ俿ҷ (˹ ) = ѧ俿 (ѵ ) x ҷ()
                            W = P x t

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