200+ câu Trắc nghiệm Tiếng Anh chuyên ngành kỹ thuật điện có đáp án - Phần 6

Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them are in the ratio :

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Two electric bulbs have resistances in the ratio 1:2. If they are joined in series, the energy consumed in them are in the ratio :

2:1

1:2

1:1

4:1

Giải thích

Chọn đáp án B