... 电阻的串联和并联(Resistors in series and in parallel) 电源和电动势（Source and electromotive force) 基尔霍夫方程组(Kirchhoff’s equations) ...
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The essay introduces a new method to measure electromotive force of source, That is using oscilloscope comparative law to measure electromotive force and internal resistance of source.
本文介绍了一种新的测量电源电动势的方法，即用示波器测电池的电动势和内电阻。
A new method of measuring electromotive force and internal resistance of source using voltmeter instead of potentiometer was studied.
讨论了用伏特计代替电位差计测电源的电动势和内阻的新方法。
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