(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In an electric circuit, consisting of copper wires with cross section area of S_{c}=5mm^{2}and a temperature of t=25C, a lead fuse is added melting when the copper wire temperature increases by Δt=25C. Find the cross section area of the lead fuse wire S_{l}=x.

specific heat: c_{c}=400J/kg*C c_{l}=140J/kg*C.

Lead melting point t_{l}=327C, latent heat λ=25000J/kg.

Specific electrical resistances of the materials: ρ_{c}=0,017*10^{-6}Ωm, ρ_{l}=0,21*10^{-6}Ωm.

material density: ρ_{c1}=8,9*10^{3}kg/m^{3}, ρ_{l1}=11,34*10^{3}kg/m^{3}.

2. Relevant equations

Q=cmΔt

Q=λm

R=lρ/S

Thank youfor any ideas on how to solve this, if there is something confusing please ask, this equation is translated from a different language so there may be inaccuracies and such.

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# Homework Help: Wires in an circuit, different materials, heat

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