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题目 (’99安徽 )将一只“ＰＺ2 2 0 - 10 0”的灯泡误接在 110伏的电路中 ,此时灯泡实际消耗的电功率为( ) .Ａ 2 0 0瓦 Ｂ 10 0瓦Ｃ 50瓦Ｄ 2 5瓦思路之一 根据Ｐ实 =Ｕ实Ｉ实 进行解题∵ Ｉ额 =Ｐ额Ｕ额=10 0瓦2 2 0伏 =511安 ,Ｒ =Ｕ额Ｉ额=2 2 0伏5/11安 =4
Topic (’99 Anhui) mis-connected a “PZ2 2 0 -10 0” bulb to a 110 volt circuit. The actual electric power consumed by the bulb is () . A 200 w B 10 0 W C 50 One of the watts D 2 5 watts according to P real = U real I to solve the problem ∵ I amount = P amount U amount = 10 0 watts 2 20 volts = 511 amps, R = U amount I amount = 2 2 0 volts 5/11 Amp=4