Question
Download Solution PDFWhich is the correct value of input resistance of a voltmeter that give accurate reading?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFA practical voltmeter must have a very high input resistance value (Ideally Infinite).
A voltmeter measures the voltage difference between the two different points but it should not change the amount of current going through the element between these two points.
So it should have high resistance so that it doesn't draw current through it.
Values of input resistance
|
Device/Source |
Ideal |
Practical |
Connection |
|
Voltmeter |
Infinite |
Very High |
Parallel |
|
Ammeter |
Zero |
Low |
Series |
|
Voltage source |
Zero |
Low |
Series |
|
Current source |
Infinite |
High |
Parallel |
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