如图是某电蒸锅的内部简化电路图,R1 、R2均为发热电阻,R1的阻值为484Ω, 加热档功率为1200W。用此电蒸锅对质量为 1.2 kg 的水加热使其温度升高 75℃, 需要的时间为 375s, 已知c水=4.2×103 J/(kg•℃)。求:
(1)保温档的功率;
(2)电阻R2的阻值;
(3)电蒸锅的加热效率
正确答案及解析
正确答案
(1)100W;(2)44Ω;(3)84%
解析
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