求中文翻譯同埋想問29條既R係12.12ohm定係20.57ohm

Kevin

2008-10-13 4:24 am

21. A circuit consists of a 15 Ohm and a 20 Ohm resistor connected in parallel across a battery of internal resistance 2 Ohm. If 60W is dissipated by the 15 Ohm resistor, calculate the current in the 20 Ohm resistor, the terminal p.d. and the emf of the battery , the total power dissipated in the external circuit.

29. A coil of 15 Ohm resistance is in parallel with a coil of 20 Ohm resistance. This combination is connected in series with a third coil of 10 Ohm resistance. If the whole circuit is connected across a battery having an e.m.f of 30V and an internal resistance of 2 Ohm,
Calculate the terminal voltage of the battery and the power in the 15 Ohm coil.

31. Two circuits, A and B, are connected in parallel to a 25V battery , which has an internal resistance of 0.25 Ohm . Circuit A consists of two resistors,7 Ohm and 3 Ohm , connected in series. Circuit B consists of two resistors , 10 Ohm and 5 Ohm , connected in series. Determine the current flowing in , and the potential difference across , each of the four resistors. Also, find the power expended in the external circuit.

求中文翻譯同埋想問29條既R係12.12ohm定係20.57ohm

回答 (1)

呠呠車

2008-10-13 6:55 am

✔ 最佳答案

21 。電路由一個15歐姆和20歐姆的電阻並聯在電池內部電阻第2歐姆。如果是消散功率為60W的15歐姆的電阻，計算出目前在20歐姆的電阻，碼頭鈀和電動勢的電池，總功率散失在外部電路。

29 。一個線圈的15歐姆的電阻並聯線圈與20歐姆的抵抗。這種組合串聯與第三圈的10歐姆的抵抗。如果整個電路連接全國的電池有一個電動勢為30V和內部阻力2歐姆，
計算端電壓的電池和電源中的15歐姆線圈。

31 。兩個電路， A和B ，是並聯一個25V的電池，這種電池有一個內部電阻0.25歐姆。阿電路由兩個電阻， 7歐姆和3歐姆，串聯。乙電路由兩個電阻器， 10歐姆， 5歐姆，串聯。確定當前的流動和潛在的差異跨越，四個電阻器。此外，找到花費的權力的外部電路。

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