The variation of the relation between internal resistance and resistance in the circuit after expanding the ammeter scale is discussed, and some guidance for improvement is also suggested.

• 摘要对电表扩大量程和改变内阻与外接电阻大小的关系进行了阐述，并对实际改进电表扩大量程需要考虑的问题进行分析讨论，提出改进方案。