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The specific heat

**s**of a material in [J/(kg deg C] is the amount of energy in joules required to raise the temperature of 1[kg] of material by one degree C. The density

**ρ**of a material in [kg/m

^{3}] is the mass in [kg] per cubic meter. If a current density

**J**exists inside a material for a time

**Δt**, show that the rise in temperature

**Δ T**in degree C given the formula (

**σ**is conductivity of the material):

**Δ T=(J**

^{2}* Δ t)/(s* σ* ρ)I don't know how to begin.

B