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in Current Electricity by (26.1k points)
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1. Name the pd between terminals of the cell when key 

  • K is open 
  • K is closed 

2. What is the reason for the difference in potential in the above two cases?

1 Answer

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by (26.7k points)
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Best answer

1. key K is open

  • e.m.f
  • voltage.

2. Emf in a circuit

E = Ir + V

When key is open, I = 0

∴ E = V

When key is closed I ? 0

∴ V = E – Ir.

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