If you connect a wire of 1.5 square meters. mm with 2.5 sq. mm which will burn off first?

Andrew asks:
Hello! Please tell me if you increase the cross-sectional area of ​​the cable 2.5 mm.kv. 1.5 mm2, then with an increase in the current supply, which wire will burn first? 2.5 or 1.5? Thanks in advance!)

 

The answer to the question:
How are they connected? Those. to connect 2.5 mm to 1.5 mm? In general, 1.5 will warm up and most likely it will burn out somewhere or isolation will leave it. But it also depends on the connections. They may not burn anything at all.
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