测量某电路中的电流时,时常会用到电流表,如果电流表只有一个单一的量程,它的实用性就不高,为了提高它的价值,利用并联电阻的分流原理制成多量程的电流表,那么应该并联多大的电阻呢?笔者通过教学实践,应用电阻并联电路的特点,从不同的角度深入分析,得出多种解决此问题的方法,供同行商榷。
开关和保险丝 An electric switch is often on a wall near the door of a room. Two wires lead to the lamp in the room. The switch is fixed in one of them. The switch can cause a break in this wire, and then the light goes. The switch can also join the two parts of the wire again, then we get a light. Switch can control many different things. Small switches control lamps and radio sets because th