初中科学题(电路)如图,灯L与一最大阻值为12欧的滑动变阻器串联,接到9V的稳压电源上,若滑动片刚滑到变阻器的中点时,灯L正常发光,且功率为3W,则灯L两端的电压值是?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 00:51:49
![初中科学题(电路)如图,灯L与一最大阻值为12欧的滑动变阻器串联,接到9V的稳压电源上,若滑动片刚滑到变阻器的中点时,灯L正常发光,且功率为3W,则灯L两端的电压值是?](/uploads/image/z/10429769-65-9.jpg?t=%E5%88%9D%E4%B8%AD%E7%A7%91%E5%AD%A6%E9%A2%98%EF%BC%88%E7%94%B5%E8%B7%AF%EF%BC%89%E5%A6%82%E5%9B%BE%2C%E7%81%AFL%E4%B8%8E%E4%B8%80%E6%9C%80%E5%A4%A7%E9%98%BB%E5%80%BC%E4%B8%BA12%E6%AC%A7%E7%9A%84%E6%BB%91%E5%8A%A8%E5%8F%98%E9%98%BB%E5%99%A8%E4%B8%B2%E8%81%94%2C%E6%8E%A5%E5%88%B09V%E7%9A%84%E7%A8%B3%E5%8E%8B%E7%94%B5%E6%BA%90%E4%B8%8A%2C%E8%8B%A5%E6%BB%91%E5%8A%A8%E7%89%87%E5%88%9A%E6%BB%91%E5%88%B0%E5%8F%98%E9%98%BB%E5%99%A8%E7%9A%84%E4%B8%AD%E7%82%B9%E6%97%B6%2C%E7%81%AFL%E6%AD%A3%E5%B8%B8%E5%8F%91%E5%85%89%2C%E4%B8%94%E5%8A%9F%E7%8E%87%E4%B8%BA3W%2C%E5%88%99%E7%81%AFL%E4%B8%A4%E7%AB%AF%E7%9A%84%E7%94%B5%E5%8E%8B%E5%80%BC%E6%98%AF%3F)
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