Draw a circuit diagram for the setup illustrated in Fig. 2.1.
Calculate the resistance $R_Y$ of resistor Y and complete Table 2.1. Use the equation: $resistance = \frac{V}{I}$ Give your answer to the nearest whole number.
The student joins resistors X and Y in a parallel arrangement. He uses this combination in the circuit in Fig. 2.1 instead of the single resistor Y. Fig. 2.2 shows the ammeter reading for the parallel arrangement. Record the reading of $I$ shown in Fig. 2.2.
The potential difference remains at $1.0\,\text{V}$. Using the value of $I$ in (b)(ii) and the equation in (b)(i), calculate the resistance $R_C$ of the parallel combination.
Theory predicts that the resistance $R_C$ of the two resistors X and Y connected in parallel is given by: $R_C = \frac{R_X R_Y}{R_X + R_Y}$ State, giving a reason, whether your value for $R_C$ in (b)(iii) agrees with this prediction.