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查阅资料可知,实验室常用0.6A~3A电流表电阻一般为0.1Ω~0.5Ω;常用3V~15V电压表内阻一般为3kΩ~12kΩ。这样,我们可以计算出上期图1中通过电表的电流为30A,远远超过电流表3A的量程,会烧坏电流表。所以,电流表的使用说明会写着:禁止不经过用电器,将电流表的两个接线柱直接连到电源的两极上,否则会烧坏电表。用电压表3V档的两个接线柱直接连接在电源两极上时,通过电压表的电流为0.003A,这样的电流当然
Access to information, laboratory commonly used 0.6A ~ 3A ammeter resistance is generally 0.1Ω ~ 0.5Ω; commonly used 3V ~ 15V voltmeter resistance is generally 3kΩ ~ 12kΩ. In this way, we can calculate that the current through the ammeter in the previous period is 30A, far beyond the range of ammeter 3A, and the ammeter will be destroyed. Therefore, the use of ammeter instructions will read: Do not pass without electrical appliances, the ammeter two terminals directly connected to the power poles, otherwise it will burn out the meter. 3V file with a voltmeter two terminals directly connected to the power poles, the current through the voltmeter 0.003A, of course, such a current