Harry sets up a circuit as shown in Figure 7 below. He measures potential difference ‘ ’ across the…
Physics20253 marksNumerical
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.
(a)[1.5]
Identify the instruments X and Y.
(b)[1.5]
Using the graph of $V$ against $I$ shown below, calculate:
(1) emf ($E$) of the cell.
(2) Internal resistance ($r$) of the cell.
Check your working with the Circuit solver (Kirchhoff's laws): every current, p.d. and power in a circuit of cells and resistors; equivalent resistance too.
Check your working with the Physics formula calculator: about 145 ISC Physics formulas: fill in what you know, with units, and get the rest.
