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B How does emf work?

  1. Jun 4, 2017 #1
    i know an emf device maintains a potential difference across a circuit. it does so by doing work on charge Carriers. this means it somehow maintains a force in the circuit. I also know there are two terminals present in an EMF device. are these terminals charged so as to maintain an electrical field and if they are charged who is keeping them charged continuously?
  2. jcsd
  3. Jun 4, 2017 #2


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    Yes. There is a force which keeps the terminals charged and maintains a potential difference between them. This force originates from chemical reactions in a battery or magnetic force in a generator.
  4. Jun 4, 2017 #3
    i know how magnetic forces work but how does chemical reactions originate forces? they can release or absorb energy. isnt it? correct me if I am wrong.
  5. Jun 4, 2017 #4


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    I don't know much about chemical reactions and resulting forces. You can post in the general physics or chemistry forums for further details.
  6. Jun 4, 2017 #5
    thanx for ur help.
  7. Jun 4, 2017 #6


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  8. Jun 4, 2017 #7
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