Since the voltage drop across the ammeter is negligible, essentially all the test voltage appears across R.

由于安培计上的电压降可以忽略，所以所有的测试电压都出现在电阻R上。

youdao

Since the voltage drop across the ammeter is negligible, essentially all the test voltage appears across R.

由于安培计上的电压降可以忽略，所以所有的测试电压都出现在电阻R上。

youdao