Question

what is the difference between potential difference and electromotive force??​

Answer 1

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The electromotive force is the measure of energy that it gives to each coulomb of charge, whereas the potential difference is the amount of energy used by the one coulomb of charge. The potential difference is the measure of energy between any two points on the circuit.

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Answer 2

Answer:

EMF:

→ Work done by a source in taking a unit charge once around complete circuit.

→ EMF exists even when ckt is open

→ EMF is independent of external resistance

→ EMF transforms energy from non electrical form to electrical form

P.D:

→ Work done in moving a charge from one point to another point.

→ P.D. exists only when ckt is closed

→ P.D depends on resistance b/w 2 points & current flowing through it

→ P.D is the actual output voltage across battery.

(i) E=EMF

V=(p−1)

(E−1r)=v discharge

(E−ir)=iR

i=

(R+r)

E

v=iR=

R+r

ER

.

(ii) v−R−ir=0

v=E+ir

chargings

(iii) v=E no internal loss.