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现行高二物理课本（必修，人教版）第３３页第（２）题；在用电器功率为 ２． ４ ｋＷ、电源电压力 ２２０ Ｖ的电路中，应不应该选用熔断电流为６Ａ的保险丝？在教学参考书第８６页中的解答为：通过用电器的电流Ｉ＝Ｐ／Ｕ＝２４００／２２０ Ａ＝１０．９ Ａ．因为 １０． ９
The current high school physics textbook (Compulsory, PEP) page 33 (2); in the use of electrical power is 2. In a circuit with 4 kW and a power supply voltage of 220 V, a fuse with a fuse current of 6 A should not be used. The answer in the reference book on page 86 is: The current through the appliance I=P/U=2400/220 A=10.9 A. Because 10. 9