Question

what is the difererence beteen voltage and emf

Answer 1

Here is no term of resistance over here. So, emf is generated by a source. Voltage is just the potential difference between two points in a circuit. ... You just put a voltmeter in two terminals of your electronic/electrical circuit you will get the voltage difference between that two points.  

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Answer 2

voltage is another word for electrical potential difference whereas emf(electromotive force) is a voltage provided by an energy source like battery