You have been told that the dc voltage of a power supply is about400 V. When you go to the instrument room to get a dc voltmeter to measure the power supply voltage, you find that there are only two dcvoltmeters available. One voltmeter is rated 300 V full scale and has asensitivity of 1000 Ω/V. The other voltmeter is rated 150 V full scaleand has a sensitivity of 800 Ω/V. (Hint: you can find the effectiveresistance of a voltmeter by multiplying its rated full-scale voltage andits sensitivity.)  How can you use the two voltmeters to check the power supplyvoltage?

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ISBN:9780133923605
Author:Robert L. Boylestad
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You have been told that the dc voltage of a power supply is about
400 V. When you go to the instrument room to get a dc voltmeter to measure the power supply voltage, you find that there are only two dc
voltmeters available. One voltmeter is rated 300 V full scale and has a
sensitivity of 1000 Ω/V. The other voltmeter is rated 150 V full scale
and has a sensitivity of 800 Ω/V. (Hint: you can find the effective
resistance of a voltmeter by multiplying its rated full-scale voltage and
its sensitivity.)

 How can you use the two voltmeters to check the power supply
voltage?

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