O‘zgaruvchan tok zanjiridagi tok kuchining effektiv qiymati Ief = 1 A, kuchlanishning effektiv qiymati esa Uef = 200 V ga teng. Agar quvvat koeffitsiyenti 0,8 bo‘lsa, tok quvvatini (W) hisoblang.
A) 160 B) 200 C) 180 D) 120