本课配套习题挑战模式1/5
在“用安阻法测电阻”的实验中,下列注意事项中,没有必要的是( )
A: 接电路时,先断开开关 |
B: 应从电源的正极开始连线,开关应靠近电源的正极 |
C: 在无法估计被测电流大小时,电流表应选用较大的量程 |
D: 将变阻器连入电路时,滑片应放在变阻器阻值最大的位置上 |
- 提示1:PHA+55S16Lev6L+e5o6l5pe277yM5byA5YWz5b+F6aG75pat5byA77yM5Zyo6L+e5o6l55S16Lev5pe277yM5Y+v5Lul5LuO55S15rqQ55qE6LSf5p6B5byA5aeL6L+e5o6lPC9wPg==
- 答案:Qg==
PHA+55S16Lev6L+e5o6l5pe277ya5byA5YWz5b+F6aG75pat5byA77yM5ruR5Yqo5Y+Y6Zi75Zmo5bqU5pS+5Zyo5pyA5aSn6Zi75YC85LiK77yMQUTmmK/mnInlv4XopoHnmoTvvIzlnKjml6Dms5XkvLDorqHooqvmtYvnlLXmtYHlpKflsI/ml7bvvIznlLXmtYHooajlupTpgInnlKjovoPlpKfnmoTph4/nqIvvvIxD5pyJ5b+F6KaB77yM5Zyo6L+e5o6l55S16Lev5pe277yM5Y+v5Lul5LuO55S15rqQ55qE6LSf5p6B5byA5aeL6L+e5o6l77yM562U5qGI77yaQjwvcD4=
本课配套习题挑战模式2/5
给你电池组,已知阻值的定值电阻R1,待测未知电阻Rx,电流表和单刀双掷开关各一个,导线若干. 用以上器材测出Rx。如图,则根据的原理是( )
A: 串联电路中,电阻比等于电压比 |
B: 并联电路中,电阻比等于电压比 |
C: 串联电路中,电阻比等于电流比 |
D: 并联电路中,电阻比等于电流的反比 |
- 提示1:PHA+6aaW5YWI5Yik5pat5Liy5bm26IGUPC9wPg==
- 提示2:PHA+5bm26IGU55S16Lev5Lit77yM55S16Zi75q+U562J5LqO55S15rWB55qE5Y+N5q+UPC9wPg==
- 答案:RA==
PHA+6aaW5YWI5Yik5pat5Liy5bm26IGU77yM55Sx5Zu+55+l77yM55S16Lev5Li65bm26IGU55S16Lev77yM5bm26IGU55S16Lev5Lit77yM55S16Zi75q+U562J5LqO55S15rWB55qE5Y+N5q+U77yMROmAiemhueato+ehrjwvcD4=
本课配套习题挑战模式3/5
用如图所示电路测电阻,将S拨到①的位置,电压为U1;将S拨到②的位置,电压为U,则求被测电阻的正确表达式为( )
A: |
B: |
C: |
D: |
- 提示1:PHA+5Liy6IGU55S16Lev77yM55S16Zi75q+U562J5LqO55S15Y6L5q+U77yM5Liy6IGU55S16Lev77yM55S16Zi75q+U562J5LqO55S15Y6L5q+UPC9wPg==
- 答案:QQ==
PHA+PGltZyBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzMxLzFBL3JCQUNGRlBTR0JhUVBtc2JBQUFtRjBpcER0czkyLmpwZWciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvMzEvMUEvckJBQ0ZGUFNHQmFRUG1zYkFBQW1GMGlwRHRzOTIuanBlZyIgaGVpZ2h0PSIxNjMiIHdpZHRoPSI0MzciPuaJgOS7pemAiUHmraPnoa48YnI+PC9wPg==
本课配套习题挑战模式4/5
小兰用两块电压表和阻值已知的电阻R0测量电阻RX的阻值,小兰选择了满足实验要求的电源、电压表V1和V2,并连接了部分实验电路,如图所示.下列补全的电路中正确的是( )
A: |
B: |
C: |
D: |
- 提示1:PHA+5LyP6Zi75rOV5rWL55S16Zi755S16Lev5b+F6aG75Liy6IGUPC9wPg==
- 提示2:PHA+5Y+M5LyP5rOV5Lit55qE5Lik5Liq55S15Y6L6KGo5b+F6aG75rWL5Ye65Lik5Liq55S15Y6L5YC8PC9wPg==
- 答案:Qw==
PHA+QeS4reeUteWOi+ihqFYxVjLmtYvnmoTpg73mmK/nlLXmupDnlLXljos8YnI+QuS4reeUteWOi+ihqFYxVjLkuZ/pg73lj6rog73mtYvlh7rnlLXmupDnlLXljos8YnI+Q+S4reeUteWOi+ihqFYx5rWLUnjkuKTnq6/nlLXljovvvIxWMua1i+eUtea6kOeUteWOizxicj5E55S16Lev5aSE5LqO5pat6Lev54q25oCBPGJyPuetlOahiO+8mkM8L3A+
本课配套习题挑战模式5/5
实验室中要测量未知电阻Rx的阻值。 下图是小华连接的实验电路。但电路连接有一处错误,改正错误后,把电阻箱的阻值调为R0,闭合开关S1,将开关S2拨到触点1时,电压表的示数为U1 ;将开关S2拨到触点2,电压表的示数为U2,则下列关于Rx的表达式正确的是()
A: |
B: |
C: |
D: |
- 提示1:PHA+5byA5YWzPGk+UzwvaT48c3ViPjI8L3N1Yj7mi6jliLDop6bngrky77yM55S15Y6L6KGo5Lik5Liq5o6l57q/5p+x5o6l5Zyo5ZCM5LiA54K577yM5rWL5LiN5Ye655S15Y6LPC9wPg==
- 提示2:PHA+5LiO5byA5YWzPGk+UzwvaT48c3ViPjI8L3N1Yj7op6bngrky55u45o6l55qE5a+857q/5bqU6K+l5o6l5ZyoUnjnmoTlj7PovrnmjqXnur/mn7HkuIo8L3A+
- 提示3:PHA+5byA5YWzPGk+UzwvaT48c3ViPjI8L3N1Yj7mi6jliLDop6bngrkx5pe277yM55S15Y6L6KGo5rWL55S15rqQ55S15Y6LLCDlvIDlhbM8aT5TPC9pPjxzdWI+Mjwvc3ViPuaLqOWIsOinpueCuTLml7bvvIznlLXljovooajmtYtSeOS4pOerr+eUteWOizwvcD4=
- 答案:Qg==
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