C1: Khi sử dụng đèn sợi đốt 220V-100W. có thể thay thế đèn huỳnh quang công suất bao nhiêu để có cùng cường độ sáng?(bỏ qua mọi yếu tố ảnh hưởng)? C2: Một phòng ăn sử dụng một máng đèn gồm hai đèn huỳnh quang đều có số liệu kĩ thuật là 220V-36W, hai đèn huỳnh quang này mắc nối tiếp hay song song? giải thích?

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