Harry sets up a circuit as shown in Figure 7 below. He measures potential difference ‘ ’ across the…
Physics20253 marksShort answer
Harry sets up a circuit as shown in Figure 7 below. He measures potential difference ‘$V$’ across the variable resistor R with an instrument Y. He also measures current ‘$I$’ flowing through R with another instrument X.
Figure 7
(a)
Identify the instruments X and Y.
(b)
Using the graph of $V$ against $I$ shown below, calculate:
(1) emf ($E$) of the cell.
(2) Internal resistance ($r$) of the cell.
