一道有关电学的英文物理题In the circuit in the figure（如图）a 20Ω resistor is inside 105g of pure water that is surrounded by insulating styrofoam.If the water is initially at 12.0℃, how long will it take for its temperature to ris

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一道有关电学的英文物理题In the circuit in the figure（如图）a 20Ω resistor is inside 105g of pure water that is surrounded by insulating styrofoam.If the water is initially at 12.0℃, how long will it take for its temperature to ris
一道有关电学的英文物理题
In the circuit in the figure（如图）a 20Ω resistor is inside 105g of pure water that is surrounded by insulating styrofoam.If the water is initially at 12.0℃, how long will it take for its temperature to rise to 59.0℃?

一道有关电学的英文物理题In the circuit in the figure（如图）a 20Ω resistor is inside 105g of pure water that is surrounded by insulating styrofoam.If the water is initially at 12.0℃, how long will it take for its temperature to ris
干路25Ω,3个支路电阻分别为20,20,10
3个支路并联电阻的总阻值为1/(1/20+1/20+1/10)=5Ω
则整个电路的电阻可以等效为30Ω
I=U/R=1A
水的比热容为4.2J/(g*K)
Q=c*m*Δt=20727J
Q=I²Rt
其中R是指加热电阻,即20Ω
t=1036.35s

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