OBJECTIVE The objective of this experiment is the study of series and parallel resistive circuits. APPARATUS Resistors, resistance box, ammeter, voltmeter, 6 V battery, connecting wires EXPERIMENTAL PROCEDURE NOTE: Record all data in the appropriate place in a table . Part I 1. Measure and record the e.m.f., E or Vo, of the battery provided. 2. Connect the circuit as shown in the diagram above. 3. Set the resistance, R, in the resistance box equal to 1 Ω. 4. Close the key, read and record the potential difference, V, on the voltmeter and the corresponding current, I, on the ammeter. 5. Repeat the experiment for R = 2, 3, 4, 5 and 6 Ω. 6. Tabulate your readings. 7. Plot a graph with V on the vertical axis and I on the horizontal axis, starting both axis from the origin (0, 0). 8. Determine the slope, s, of the graph and the intercept on the vertical axis. 9. State two precautions taken to ensure accurate results. Part II 1.If the potential difference across the resistance box in the circuit is measured, it would be observed that its value is less than the e.m.f. of the cell. 2. Explain what is meant by the potential difference between two points in an electric circuit. 3. A cell has e.m.f. of 3V. when it is connected across a resistor of resistance 4 Ω, a current of 0.5 A passes through the circuit. 4. Calculate the internal resistance of the cell.