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Physics, 26.10.2021 01:30 Yomarie1104

R1 nối tiếp (đèn song song mn) Có r1=20 ôm, đèn:20v-100w , mn là 1 dd bằng nhôm có l=5000m s=0,2mm^2
a) tính r đèn, r mn ??
b)u=220v, r biến trở bằng 100v hỏi Pđèn P biến Pr
c) r biến trở = 100 ôm đèn sáng bình thường u=?

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R1 nối tiếp (đèn song song mn) Có r1=20 ôm, đèn:20v-100w , mn là 1 dd bằng nhôm có l=5000m s=0,2mm...
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