Current carrying algorithm of copper wire Generally, the safe current carrying capacity of copper conductor is 5-8a / mm2, and that of aluminum conductor is 3-5a / mm2 For example: The recommended safe current carrying capacity of 1.5mm2bvv copper conductor is 1.5 × 8A / mm2 = 12a The recommended safe current carrying capacity of 2.5mm2bvv copper conductor is 2.5 × 8A / mm2 = 20A The recommended safe current carrying capacity of 4mm2bvv copper conductor is 4 × 8A / mm2 = 32A Why add BVV copper wire? Is it OK for me to calculate the current carrying capacity of copper wire in the future according to the above? But I see that there is a formula algorithm. Are these two the same

Current carrying algorithm of copper wire Generally, the safe current carrying capacity of copper conductor is 5-8a / mm2, and that of aluminum conductor is 3-5a / mm2 For example: The recommended safe current carrying capacity of 1.5mm2bvv copper conductor is 1.5 × 8A / mm2 = 12a The recommended safe current carrying capacity of 2.5mm2bvv copper conductor is 2.5 × 8A / mm2 = 20A The recommended safe current carrying capacity of 4mm2bvv copper conductor is 4 × 8A / mm2 = 32A Why add BVV copper wire? Is it OK for me to calculate the current carrying capacity of copper wire in the future according to the above? But I see that there is a formula algorithm. Are these two the same

I bought a 380V 1000W electric heater. If the power supply is only 220V, how much is its actual heating power?

For the same electrical appliance, the power is proportional to the square of the voltage. P = u & # 178 / R. because of the same resistance, P1 / P2 = U1 & # 178 / U2 & # 178; actual power = 1000x220 & # 178 / 380 & # 178; = 333w