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在电表示数变化的题目中,电阻变化是引 起电路中电流、电压发生变化的根本原因．在 分析中,要抓住电源电压不变这一关键,着眼于 电阻变化才致使电流、电压改变,从而引起电表 示数变化的实质,遵循正确的分析步骤,总结其 中规律,问题就容易解决了． 例1 如图1所示,电源两端电压保持不 在电表示数变化的题目中,电阻变化是引 起电路中电流、电压发生变化的根本原因．在 分析中,要抓住电源电压不变这一关键,着眼于 电阻变化才致使电流、电压改变,从而引起电表 示数变化的实质,遵循正确的分析步骤,总结其 中规律,问题就容易解决了． 例1 如图1所示,电源两端电压保持不
In the problem of changes in the number of electrical representations, the change in resistance is the root cause of current and voltage changes in the circuit. In the analysis, we must grasp the key to the same power supply voltage, focusing on the changes in the resistance caused by changes in current, voltage, resulting in the nature of the number of changes in the number of electricity, follow the correct analysis steps, summarize the rules, the problem is easy to solve . Example 1 As shown in Figure 1, the voltage across the power supply does not remain in the problem of changes in the number of electrical representations. The change in resistance is the root cause of current and voltage changes in the circuit. In the analysis, we must grasp the key to the same power supply voltage, focusing on the changes in the resistance caused by changes in current, voltage, resulting in the nature of the number of changes in the number of electricity, follow the correct analysis steps, summarize the rules, the problem is easy to solve . Example 1 As shown in Figure 1, the voltage across the power supply is not maintained