For a polysilicon wire with a length of L = 60 µm, a cross section of A = 2 × 4 µm is used as a hot-wire sensor. The temperature coefficient and thermal conductivity of polysilicon are 8 × 10−4K −1...

For a polysilicon wire with a length of L = 60 µm, a cross section of A = 2 × 4 µm is used as a hot-wire sensor. The temperature coefficient and thermal conductivity of polysilicon are 8 × 10−4K −1 and 32W m−1K −1 , respectively. The bulk substrate temperature is 25◦C. The resistivity of polysilicon at 25◦C is 4×10−5 Ωm. Determine the current required for a maximum temperature of 200◦C at the center of the wire