手机电池点香烟
原理:
电热丝长度0.03m,重量为G=0.06m×0.014g/M=0.00084g
从常温20℃到高温400℃的绝对温差为380K
所以使0.06m铁铬铝电热丝从常温升高至400℃需要的能量为
Q=0.44J/G·K×0.00084g×380K÷0.6=0.24J
直径为0.05m2长度为0.06m铁铬铝电热丝的电阻为
R=700Ω/M×0.06m=42Ω
点烟所需时间为6s,手机输出给电热丝的能量和电流
W=U2/R×T=(3.7V)2/42Ω×6s≈2J>Q
I=U/R=3.7V/42Ω≈90mA<900mA
按照6s点燃一根香烟,3.7V 900mAh的手机电池大概可以点烟的次数
C=3.7V×0.9A×3600s/2J≈6000次
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- Author: shisekong
- Link: https://blog.361way.com/phone-battery-smoke/2696.html
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