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Questions and Answers
What is the role of electromotive force in electrochemical cells and generators?
What is the role of electromotive force in electrochemical cells and generators?
- It is a measure of the temperature effect on reaction rates.
- It is the work done on a unit electric charge. (correct)
- It acts as a magnetic field strength.
- It represents the current flowing in the circuit.
In the equation V = Ir, what does 'r' represent?
In the equation V = Ir, what does 'r' represent?
- Internal resistance of the cell (correct)
- Voltage drop across the circuit
- Total electrical energy produced
- Resistive load in an external circuit
How is electromotive force commonly abbreviated?
How is electromotive force commonly abbreviated?
- ECF
- ECP
- EFT
- EMF (correct)
How does a generator or battery produce electromotive force?
How does a generator or battery produce electromotive force?
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Which law is applied in the use of electromotive force in electromagnetic flowmeters?
Which law is applied in the use of electromotive force in electromagnetic flowmeters?
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Study Notes
Electromotive Force (EMF)
- Defined as the electric potential generated by an electrochemical cell or by a changing magnetic field.
- Commonly abbreviated as EMF.
Energy Conversion Devices
- Generators and batteries convert energy from one form to another.
- One terminal of these devices becomes positively charged, while the opposite terminal becomes negatively charged.
- EMF represents the work done on a unit electric charge.
Application in Electromagnetic Flowmeters
- EMF is utilized in electromagnetic flowmeters, demonstrating Faraday’s law of induction.
Voltage Equation
- The relationship between voltage (V), current (I), internal resistance (r), and electromotive force (ε) is expressed as:
- V = Ir
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