Question

establish the expression for current flowing through an external resistance R connected to a cell of e.m.f E and internal resistance r.​

Answer 1

Explanation:

I= V÷Req

i.e Req= R+r

therefore

current through the circuit

I=V/R+r

Answer 2

Expression of current will be equal to $\frac{E}{R+r}$

Explanation:

Let the emf of the battery is E

External resistance is R

And internal resistance of the battery is r

As the battery is connected in series with the circuit

So total equivalent resistance = R+r

According to ohm's law current is given by

$Current=\frac{voltage}{resistance}=\frac{E}{R+r}$

So expression of current will be equal to $\frac{E}{R+r}$

Learn more

Two cells one of e.m.f. 2 volt and internal resistance of 0.5 ohm, and the other of e.m.f. 1.5 volt

and internal resistance 5 ohm are connected in parallel and used to send a current through an

external resistance of 4 ohm. Calculate the current in each part of the circuit.​

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