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To measure the electromotive force (EMF) of a cell accurately, use a voltmeter with high precision and connect it to the terminals of the cell. Ensure the cell is not connected to any external circuit during the measurement to prevent errors. Take multiple readings and calculate the average to minimize inaccuracies.
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What does the voltmeter measure when it is across the cell?
When a voltmeter is connected across a cell, it measures the potential difference, or voltage, between the two terminals of the cell. This reading indicates the electromotive force (emf) generated by the cell, which is a measure of the cell's ability to provide electrical energy to a circuit.
What device do we use to measure force?
A device often used to measure force is called a dynamometer. It typically consists of a spring or load cell that deforms under applied force and provides a reading of the amount of force being exerted.
Is potential difference always less than emf of the cell?
No. Because during charging process of a battery current flows in opposite direction to the discharging/consumption. so equation Emf=P.d. +Ir is changed to Emf=p.d. +Ir. Hence during charging process of a battery Potential difference is greater than electromotive force.
What measures the force of compression?
To measure a force, depends on how the force is applied. For example if it is a piston rod actuated by a piston, you can measure the pressure inside the cylinder containing the piston, this may be filled with gas or liquid, and calculate the force from the area of the piston/cylinder. If it is a lever system, work out the mechanical advantage of the levers and multiply by the actuating force, probably obtained as above. You can also measure force directly using a strain gauge between the applying force and the object.
Why emf of cell measurd by potentiometre is accurate?
The electromotive force (emf) of a cell measured by a potentiometer is accurate because a potentiometer measures the potential difference between the two electrodes without drawing any current from the cell, leading to minimal disturbance in the cell's internal resistance. This allows for a more precise measurement of the emf of the cell under open circuit conditions.
Which unit of measure is used to indicate Ecell?
The unit of measure used to indicate Ecell, which is the cell potential or electromotive force of a cell, is volts (V).
What does the voltmeter measure when it is across the cell?
When a voltmeter is connected across a cell, it measures the potential difference, or voltage, between the two terminals of the cell. This reading indicates the electromotive force (emf) generated by the cell, which is a measure of the cell's ability to provide electrical energy to a circuit.
Is electromotive a chemical property?
No, electromotive force is not a chemical property. It is a physical property related to the ability of a substance to generate an electrical potential difference when in a chemical reaction or an electrochemical cell.
What is the cell potential?
Cell potential, also known as electromotive force (EMF), is the measure of the driving force behind the flow of electrons in an electrochemical cell. It is the difference in electric potential between two electrodes in a cell and is a measure of the cell's ability to produce an electric current. The cell potential is a key factor in determining the feasibility and direction of redox reactions in a cell.
What is electrolytic cells?
It is a cell that contains an electrolyte in which an electrochemical reaction produces an electromotive force.
What is electrode potential-?
Electrode potential is the voltage that an electrode is at. This has to be measured versus a reference electrode
Open circuit emf of a cell?
ELECTROMOTIVE MAGNETIC FORCE emf measured as volts . It does not guarantees a current or power but just the force is present. With a load it may disappear
How do you measure weight with a load cell?
I measure weight with a load cell by using its ability to convert force into an electrical signal. When weight is applied, the load cell deforms slightly, and its internal strain gauges detect this deformation, producing a proportional electrical output. I then use a signal conditioner or microcontroller to interpret this output and display the weight accurately.
What is galvanic cell?
A galvanic cell is an electric cell that generates an electromotive force by an irreversible conversion of chemical to electrical energy.
How does a Dry Cell battery work?
An electromotive force is generated from chemical reactions inside the cell. Carbon - zinc, iron - nickel, lead - sulphuric acid, are common ones. An individual cell is just that, a cell. Strictly, a battery is a collection of such cells
What device do we use to measure force?
A device often used to measure force is called a dynamometer. It typically consists of a spring or load cell that deforms under applied force and provides a reading of the amount of force being exerted.
Why emf falls even when the cell is not in use?
When a cell is not in use, there can still be a small amount of current flowing through it due to internal factors like self-discharge or leakage currents. This internal current can lead to a drop in the cell's electromotive force (EMF) over time, even when the cell is not actively powering a device.
