Question

Answer the following questions.

1. What do you understand by the following terms pertaining to a cell:

(a) emf

(b) terminal voltage

(c) internal resistance.

1.2 Derive a relation that connects the above mentioned terms.

Answer 1

ANSWER

Let E be the e.m.f and V be the terminal voltage

The current delivered ( I ) to a load ( R) from a cell with internal resistance (r) can be calculated as:

I=

R+r

E

And the Potential difference across the load or the Terminal Voltage can be calculated as:

V=I.R=

R+r

ER

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