A circuit you're building needs an ammeter that goes from (0 mathrm{~mA}) to a full-scale reading of

Question:

A circuit you're building needs an ammeter that goes from \(0 \mathrm{~mA}\) to a full-scale reading of \(50.0 \mathrm{~mA}\). Unfortunately, the only ammeter in the storeroom goes from \(0 \mu \mathrm{A}\) to a fullscale reading of only \(500 \mu \mathrm{A}\). Fortunately, you can make this ammeter work by putting it in a measuring circuit, as shown in Figure P23.66. This lets a certain fraction of the current pass through the meter; knowing this value, you cân deduce the total current. Assume that the ammeter is ideal.

a. What value of \(R\) must you use so that the meter will go to full scale when the current \(I\) is \(50.0 \mathrm{~mA}\) ?

b. What is the equivalent resistance of your measuring circuit?image text in transcribed

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question

College Physics A Strategic Approach

ISBN: 9780321907240

3rd Edition

Authors: Randall D. Knight, Brian Jones, Stuart Field

Question Posted: