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Draw the circuit diagram.

May 16, 2026Physics

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Step 1: Draw the circuit diagram.
The circuit diagram for the experiment, as described and partially shown in the provided image, consists of:

A battery of three cells in series, representing the electromotive force (Emf) and internal resistance ( $r$ ).
A voltmeter (V) connected in parallel across the terminals of the battery to measure the potential difference.
An ammeter (A) connected in series with the external circuit to measure the current ( $I$ ).
A variable resistor ( $R_{ext}$ ) connected in series with the ammeter.
An open switch (S) connected in series with the ammeter and variable resistor.

\begin{tikzpicture}[
    circuit ee,
    scale=0.8,
    transform shape

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