Topic: Internal Resistance Of A Voltmeter
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Answers to Common Questions
How do you determine internal resistance of voltmeter?
By Ohm's law, resistance is voltage divided by current, so you can determine the resistance of a voltmeter by measuring the total current required to drive it to full scale on each range. In typical digital voltmeters, the resistance is fix... Read More »
Source: http://wiki.answers.com/Q/How_do_you_determine_internal_resistanc...
Why is the internal resistance of a voltmeter made to be high?
The reason is that if the impedance were low that would act as an additional load on the circuit being measured and provide a false reading. Further information Since voltmeters are always connected in parallel with the component or compone... Read More »
Source: http://wiki.answers.com/Q/Why_is_the_internal_resistance_of_a_vol...
How can you calculate the internal resistance of an analog voltme...
Most commercial lab meter are set to 11 megohm as a standard to find the resistance put a small dc source in series with an 11mega resistor then the meter reading will display current passing though the meter Read More »
Source: http://wiki.answers.com/Q/How_can_you_calculate_the_internal_resi...
More Common Questions
Answers to Other Common Questions
Typically commercial testers were designed for an output impedance of 11 megohm.
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Source: http://wiki.answers.com/Q/What_is_the_ideal_resistance_of_a_voltm...
1 to 1000 what? I'll assume ohms. aprox and quick answer: 1/.0005 = 2000 1000Ω x 2000 = 2000000Ω or 2 MΩ .
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Source: http://answers.yahoo.com/question/index?qid=20100216172459AArbHzM
Let's assume a test circuit with a 12V source and two 1kohm resistors connected in series. The voltage drop across each resistor is 6V. The voltmeter is connected in parallel, so it behaves like a parallel resistor and steals current from t...
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Source: http://answers.yahoo.com/question/index?qid=20080604051204AAga6WC
Infinite resistance at a certain point in an electrical circuit means that no electrical current gets through. It is an opening in the circuit, the opposite of continuity. The purpose of checking for infinite resistance is to find a break i...
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Source: http://www.ehow.com/how_6465504_use-voltmeter-determine-infinite-...
infinity- so that all the voltage is measured across the component instead of losing some in voltometer circuitry
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Source: http://wiki.answers.com/Q/What_should_be_the_resistance_of_an_ide...
Voltmeters are designed to have a high resistance (usually 1 MΩ or 10 MΩ), so that they don't affect the voltage they are measuring.
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Source: http://wiki.answers.com/Q/What_resistance_does_a_voltmeter_have
An IDEAL voltmeter would measure the voltage at the test point without becoming a part of the circuit. The only way to not become any part of the circuit at all is to have an infinite resistance, in other words, infinity Ohms. (In the case ...
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Source: http://wiki.answers.com/Q/What_would_be_the_resistance_of_an_idea...
