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?
KVL and KCL
KVL stands for Kirchhoff voltage law. KVL states that the total voltage drops around the loop in any closed electric circuit is equal to the sum of total voltage drop in the same closed loop.
Sign Convention
Science and technology incorporate some ideas and techniques of their own to understand a system skilfully and easily. These techniques are called conventions. For example: Sign conventions of mirrors are used to understand the phenomenon of reflection and refraction in an easier way.
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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