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Why potentiometer method is an accurate method for measuring potential difference?
Wiki User
∙ 12y ago
Say 'emf' instead potential difference.
Because while measuring the same no current is drawn and just balancing the potential across with the potential drop on the balancing length of the potentiometer wire. While balancing the galvanometer shows null deflection. So no current flows through the galvanometer. A perfect balance with the potential difference (EMF) of a cell with potential drop across that particular length.
Wiki User
∙ 12y ago
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Why do you measure emf with a potentiometer not with voltmeter?
EMF (E''electromotive Force'') is another term for Volts, hence the E in electronic formulas and EMF is measured with a volt meter. A potentiometer is not a meter at all, it is a variable resistor
How you can do Calibration of voltmeter by potentiometer?
A: The only calibration that a potentiometer is allow to do is on the resistance scale. The reason being is the internal battery looses capability with age so to compensate the pot. will change current available to make the ohmmeter to go to zero when the probes are shorted. To test a volts range then an accurate voltage must be used to verify calibration.
What is the purpose of a potentiometer?
A potentiometer is a type of position sensor. They are used to measure displacement in any direction. Linear potentiometers linearly measure displacement and rotary potentiometers measure rotational displacement. Also known as a Potmeter or Pot, it consists of a resistive element called the track and a sliding contact called the wiper internally where end terminals are attached to the resistive element. They are used to accurately measure voltage and help achieve a variable voltage from a fixed-voltage source. Common Examples of Potentiometers are: Measuring Position on a gaming joystick Controlling audio equipment using volume controls
What is the difference between a try square and an engineer square?
The main difference is in accuracy. An engineers or machinist's square is not adjustable, nor do they have a scale, they are also accurate on the "outside". Most try squares are only accurate on the inside, unless they have brass strips on both sides of the body, which would indicate squareness on the outside as well
Distinguish between accuracy and precision of a measurement?
Measurements are precise when they are all very similar (ie, if a temperature was measured as 23.2C, 23.1C, and 23.3C). Measurements are accurate when they are close to a known value (such as 100.01C measured as the boiling point of pure water at 1 atm).
Why emf of cell measurd by potentiometre is accurate?
The potentiometer is designed in such a way that no current is taken from the circuit you are measuring.
Why potentiometer is more accurate than voltmeter?
volt meter draws current from the device whose reading is to be taken and potentiometer does not draw current from the device so it is better to use potentiometer than voltmeter
What is an accurate way of measuring angles?
A protractor is the most accurate way of measuring angles.
What does a potentiometer do?
A potentiometer varies the amount of current through an electrical or electronic circuit. EX: the volume control on your radio is a potentiometer. In today's electronic circuitry, digital circuits that change resistance do the same job as the rotary type control do. They tend to be more accurate.
What is something that is accurate?
Precision measuring tools such as micrometers are accurate
What provides the most accurate volume?
The glassware that provides the most accurate measurement of volume is the measuring cup. A glass measuring cup has lines on it to give an accurate reading.
What is the difference between measuring a solid than a liquid?
With liquids you can just stick in a thermometer into it. But with solids sometimes you can't do that (because it's solid obviously) so I guess measuring liquids is more accurate in most cases.
When you do an experiment is it important to have all measuring accurate?
It would be pointless doing the experiment and not measuring accurately
What is the least accurate system for measuring medicine?
A pitchfork.
Is measuring tape accurate?
it's a millimeter accuracy.
What are the uses of measuring tools?
To obtain accurate measurements.
What is the most accurate laboratory apparatus used in measuring the volume of liquid?
the pipette is the most accurate
