Terminal PD vs EMF: When is PD Greater?

  • Thread starter Himal kharel
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    Emf Pd
Where E:EMF of the cell. I:current. r:internal resistance of the cell.In summary, the terminal voltage of a cell is greater than the EMF when the cell is charging. This is because the EMF of a cell is the potential difference across its terminals when no current is drawn from it, whereas the terminal voltage is the potential difference across the cell when a current is drawn from it. During charging, the terminal voltage lags behind the EMF due to the internal resistance of the cell.
  • #1
Himal kharel
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when is terminal pd greater than emf ?
 
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  • #2
You need to explain your terms and circumstances more thoroughly.
 
  • #3
Terminal pd of a cell exceeds the emf when the cell is charging.
 
  • #4
Hi, EMF of a cell is the pd across its terminals when no current is drawn from it. Terminal voltage is the PD across a cell when a current is drawn from it. When the circuit drawn current e.m.f is larger than terminal voltage. During charging terminal voltage lags behind the e.m.f.
 
  • #5
Terminal voltage V=E-Ir , when nod charging. Where,E:EMF of the cell. I:current. r:internal resistance of the cell.
Terminal voltage,V=E+Ir , when charging.
 

Related to Terminal PD vs EMF: When is PD Greater?

1. What is Terminal PD?

Terminal PD, or terminal potential difference, refers to the difference in electrical potential between the positive and negative terminals of a circuit.

2. What is EMF?

EMF, or electromotive force, is the force that causes electric charges to move in a circuit. It is often measured in volts.

3. How do you determine when PD is greater in a circuit?

To determine when PD is greater in a circuit, you must compare the magnitude of the EMF and the terminal PD. If the EMF is greater, then the PD will be greater. However, if the resistance of the circuit is high, the PD may decrease and become less than the EMF.

4. What factors affect the relationship between Terminal PD and EMF?

The relationship between Terminal PD and EMF is affected by the resistance of the circuit, the type of materials used in the circuit, and the amount of current flowing through the circuit. Additionally, the presence of other components such as capacitors or inductors can also affect this relationship.

5. Why is it important to understand the difference between Terminal PD and EMF?

Understanding the difference between Terminal PD and EMF is important in order to properly analyze and design electrical circuits. It allows us to accurately predict the behavior of the circuit and make informed decisions about component selection and circuit optimization.

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