神马作文网一道有关电学的英文物理题
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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 rise to 59.0℃?
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℃?
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
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