Question

The resistance of a 20 mV voltmeter is 1000 ohm. How can you convert this voltmeter into an ammeter which can measure up to 2.0 A.

Answer 1

Answer:

To solve a problem first define the problem: you have a meter that has 100 ohms resistance and full scale deflection requires 5 m, and you want it to measure 10 V at full scale. First find resistance to drop 10 volts at 5 ma. R=E/I, R=10/.005=2000 ohms, then subtract the meters internal resistance,

2000–100=1900. So 1900 ohms is the required resistance in series with the meter. This may require two or more resistors.

Hope this helps you