Physics, 27.10.2021 15:40, chart9968

Một bóng đèn có ghi (220V - 50W). Công suất điện của bóng đèn bằng 50W nếu bóng đèn được mắc vào hiệu điện thế.

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Một bóng đèn có ghi (220V - 50W). Công suất điện của bóng đèn bằng 50W nếu bóng đèn được mắc vào hiệ...