The voltmeter is connected to the terminals of a current source with an EMF of 9 volts. What are the readings

| June 10, 2021 | education

The voltmeter is connected to the terminals of a current source with an EMF of 9 volts. What are the readings of the voltmeter if: a) the load is not connected to the terminals and the source; b) are the source terminals shorted with a thin short wire?

A voltmeter is essentially a device with a very large internal resistance R, and therefore, when it is connected to a battery, when it is connected in parallel, there is practically no current flowing into it, and the real voltage E of the battery is measured. Let’s consider both cases.

a) no load is connected to the terminals of the source; in this case, only a voltmeter is connected in parallel to the battery, and the voltage shows U = E = 9V.

b) the terminals of the source are closed with a thin short wire, in this case a short circuit (short circuit) of the battery occurs, and the voltmeter shows U = 0.



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