已知电流表的内阻Rg=100Ω，满偏电流Ig=3mA．要把它改装成量程是6V的电压表，应串联的电阻R1=______Ω；要把它改装成量程是3A的电流表，应并联的电阻R2=______Ω．
改装成电压表要串联电阻分压串阻值为：
R=
-Rg=U Ig
-100=1900Ω6 3×10-3
改装成电流表要并联电阻分流，并联电阻阻值为：
R=
=IgRg I-Ig
≈0.1Ω3×10-3×100 3-3×10-3
故答案为：1900Ω，0.1Ω
| 用方框中适当的词填空 | |
2. No, I_______sing. 3. What club does she_______ to join? 4. He doesn't want to join the_______ club because he doesn't like music. 5. I can't play the_______ , but I can sing well. 6. We are playing games. Can you_______ us? 7. Li Xingming likes sports. He plays _______very well. 8. _______ club does she want to join? 9. Lucy wants to join the art_______ 10. —What can you_______ ? —I can swim. |