phy MC question
2007-04-06 7:40 pm
A moving coil milliammeter has a resistance of 10ohm and a full-scale deflection of 0.01A. It is converted into an ammeter with a full-scale deflection of 1.0A by connecting a resistor R to it. Which of the following shows the resistance of R and the method of connection?
回答 (1)
2007-04-06 8:26 pm
✔ 最佳答案
SOLUTIONObviously, the resistor R should be in parallel, otherwise the current will not change.
There are (1-0.01) A=0.99 A current flow into the resistor R
Since the voltage of 10 ohm resistor and resistor R is the same
So
0.01*10=0.99*resistance of R
resistance of R=0.10
The answer is A
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