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Two fixed value resistors R1 and R2 are connected in series to the power supply, and the total power is P1. They are connected in parallel to the original power supply, and the total power is P2. Assuming that the output voltage of the power supply does not change, then () A. P1 ＞ P2 B. P1 ＜ P2 C. P1 = P2 D. cannot be determined Is there an easier way to copy? Please don't wait online,
According to the power formula: P = u ^ 2 / R
When in series, the resistance is larger, so the power is smaller
When parallel, the resistance is small, so the power is large
So the correct answer is B. P1 < P2
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