问题
填空题
某电路两端电压一定，当接上45Ω的电阻时，通过电路的电流强度是0.8A．当用60Ω的电阻代替45Ω的电阻时，通过电路中的电流强度是______A．
答案
电路两端的电压：U=IR=0.8A×45Ω=36V；
当用60Ω的电阻代替45Ω的电阻时，通过电路中的电流强度：I′=
=U R′
=0.6A．36V 60Ω
故答案为 0.6．
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某电路两端电压一定，当接上45Ω的电阻时，通过电路的电流强度是0.8A．当用60Ω的电阻代替45Ω的电阻时，通过电路中的电流强度是______A．
电路两端的电压：U=IR=0.8A×45Ω=36V；
当用60Ω的电阻代替45Ω的电阻时，通过电路中的电流强度：I′=
=U R′
=0.6A．36V 60Ω
故答案为 0.6．
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