1/5单选题
难度：
1.
如图所示，电源电压保持12V不变，R1=30Ω，变阻器R2的阻值变化范围是0～20Ω. 开关S闭合，当变阻器滑片P由a端滑至b端过程中电压表示数的变化范围为（ ）
| A | 7.2V～0V |
| B | 4.8V～0V |
| C | 4.8V～7.2V |
| D | 4.8V～12V |
- 提示1：
- PHA+5Liy6IGU5YiG5Y6LLOeUtemYu+i2iuWkpyzliIblvpfnmoTnlLXljovotorlpKc8L3A+
- 提示2：
- PHA+5ruR5Yqo5Y+Y6Zi75Zmo5ruR5Yqo55qE6L+H56iL5LitLOi/nuWFpeeUtei3r+eahOmYu+WAvOS4jeWPmDwvcD4=
正确答案：Qg==
PGRpdj7kuLLogZTnlLXot6/liIbljovjgILkvYbmmK/nlLHkuo7mu5Hliqjlj5jpmLvlmajnmoTmu5HniYfkuI7nlLXljovooajov57mjqXvvIzliJnov57lhaXnlLXot6/nmoTpmLvlgLzkuI3lj5jjgILmu5Hliqjlj5jpmLvlmajkuKTnq6/nmoTnlLXljovpmo/nnYDmu5HniYfnmoTnp7vliqjvvIznpLrmlbDlop7lpKfjgILlvZNSPHN1Yj4yPC9zdWI+PTIwzqnml7bvvIzmoLnmja5JPTxpbWcgc3JjPSJodHRwczovL3AxLnFpbmdndW8uY29tL0cxL00wMC8wMC85OC9yQkFDRkZNTWFhalRNcmdKQUFBQm9CVG9ITlU5MjcucG5nIiBkYXRhLWNrZS1zYXZlZC1zcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzAwLzk4L3JCQUNGRk1NYWFqVE1yZ0pBQUFCb0JUb0hOVTkyNy5wbmciIGhlaWdodD0iNDIiIHdpZHRoPSIzMiI+77yM6Kej5b6X55S15rWB5pyA5aSn5Li6MC4yNEHvvIzliJlSPHN1Yj4yPC9zdWI+5Lik56uv55S15Y6LVT1JwrdSPHN1Yj4yPC9zdWI+77yM55S15Y6L5pyA5aSn5Li6NC44Vu+8jOW9k+aOpeWFpeeUtei3r+eahOeUtemYu+S4ujDml7bvvIzkuKTnq6/nlLXljovkuLowPC9kaXY+
2/5单选题
难度：
2.在如图所示的电路中，电源电压U保持不变，定值电阻R=20Ω. 闭合开关s，当滑动变阻器R′的滑片P在中点c时，电流表示数为0.4A，当移动滑片P至最右端时，电流表示数为0.3A. 则电源电压U与滑动变阻器R′的最大阻值为（ ）
| A | 6V 10Ω |
| B | 6V 20Ω |
| C | 12V 20Ω |
| D | 12V 40Ω |
- 提示1：
- IOS4suiBlOWIhuWOiw==
- 提示2：
- IOeUtea6kOeUteWOi+S4jeWPmA==
正确答案：Qw==
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
3/5单选题
难度：
3.所示的电路中，电源电压恒定为6V，定值电阻R1的阻值为10Ω，滑动变阻器R2的最大阻值为50Ω，当开关S闭合，滑动变阻器的滑片由b端移到a端的过程中，下列说法中正确的是（ ）
| A | 电压表的示数变大，电流表的示数变小 |
| B | 电压表和电流表的比值变小 |
| C | 电流表的示数由0.1A变为0.6A |
| D | 电压表的示数由6V变为1V |
- 提示1：
- IOS4suiBlOeUtei3r+WIhuWOiw==
- 提示2：
- IOa7keWKqOWPmOmYu+WZqOa7keeJh+a7keWKqOi/h+eoi+S4rei/nuWFpeeUtei3r+eahOmYu+WAvOWHj+Wwjw==
正确答案：Qw==
PGRpdj7nlLXljovooajnpLrmlbDlop7lpKfvvIznlLExVuWPmOS4uuacgOe7iOeahDZW77yM55S15rWB6KGo56S65pWw5aKe5aSn77yM55SxMC4xQeWPmOS4ujAuNkE8L2Rpdj4=
4/5单选题
难度：
4.
如图所示电路中电源电压为6V，R1=5Ω，滑动变阻器R2的最大阻值为10Ω，闭合开关S，将滑动变阻器的滑片P从中点移动到最右端，电流表示数变化范围是（ ）
| A | 0.3A-0.5A |
| B | 0.4A-0.2A |
| C | 1.2A-0.6A |
| D | 0.6A-0.4A |
- 提示1：
- PHA+5ruR5Yqo5Y+Y6Zi75Zmo5o6l5Lit54K55pe277yM55S16Lev55qE5oC755S16Zi75Li6MTA8c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNCI+zqk8L3NwYW4+PC9zcGFuPjxzcGFuPiA8L3NwYW4+PGJyPjwvcD4=
- 提示2：
- PHA+5ruR5Yqo5Y+Y6Zi75Zmo5ruR54mH5ruR5Yiw5pyA5Y+z56uv5pe277yM55S16Lev55qE5oC755S16Zi75Li6MTUgPHNwYW4gY2xhc3M9Im1hdGhxdWlsbC1yZW5kZXJlZC1tYXRoIiBzdHlsZT0iZm9udC1zaXplOjIwcHg7Ij48c3BhbiBjbGFzcz0idGV4dGFyZWEiPjx0ZXh0YXJlYSBkYXRhLWNrZS1lZGl0YWJsZT0iMSIgY29udGVudGVkaXRhYmxlPSJmYWxzZSI+PC90ZXh0YXJlYT48L3NwYW4+PHNwYW4gbWF0aHF1aWxsLWNvbW1hbmQtaWQ9IjQiPs6pPC9zcGFuPjwvc3Bhbj48c3Bhbj4mbmJzcDs8L3NwYW4+PGJyPjwvcD4=
正确答案：RA==
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
5/5单选题
难度：
5.
如图所示，电源电压为6V不变，电压表用0～15V量程，电流表用0～0.6A量程，R1=10Ω，滑动变阻器的阻值范围为0～20Ω. 当滑动变阻器滑片从最左端滑到最右端时，电压表和电流表的变化范围分别是（ ）
| A | 0～4V, 0.5A-0.2A |
| B | 0～3V, 0.6A-0.2A |
| C | 0～4V, 0.6A-0.2A |
| D | 1V～4V, 0.6A-0.2A |
- 提示1：
- PHA+5ruR5Yqo5Y+Y6Zi75Zmo5ruR54mH5Zyo5pyA5bem56uv5pe277yM6L+e5YWl55S16Lev5Lit55qE55S16Zi75Li6MOOAgueUtei3r+S4reeahOeUtea1geS4ujAuNkHvvIzmraTml7bnlLXljovooajnpLrmlbDkuLowPC9wPg==
- 提示2：
- PHA+5ruR5Yqo5Y+Y6Zi75Zmo5ruR54mH5Zyo5pyA5Y+z56uv5pe277yM6L+e5YWl55S16Lev5Lit55qE55S16Zi75Li6MjA8c3BhbiBjbGFzcz0ibWF0aHF1aWxsLXJlbmRlcmVkLW1hdGgiIHN0eWxlPSJmb250LXNpemU6MjBweDsiPjxzcGFuIGNsYXNzPSJ0ZXh0YXJlYSI+PHRleHRhcmVhIGRhdGEtY2tlLWVkaXRhYmxlPSIxIiBjb250ZW50ZWRpdGFibGU9ImZhbHNlIj48L3RleHRhcmVhPjwvc3Bhbj48c3BhbiBtYXRocXVpbGwtY29tbWFuZC1pZD0iNCI+zqk8L3NwYW4+PC9zcGFuPjxzcGFuPiZuYnNwOzwvc3Bhbj7jgILnlLXot6/kuK3nmoTnlLXmtYHkuLowLjJB77yM5q2k5pe255S15Y6L6KGo56S65pWw5Li6NFY8L3A+
正确答案：Qw==
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