A student investigates circuits containing different combinations of resistors. Circuit A is shown in Fig. 3.1. Circuit A is not complete. Fig. 3.1 The circuits use a 3 V power supply. Briefly explain why resistor $$\(R_{p}\)$$, shown in Fig. 3.1, must remain in place throughout the experiment. $$\(\mathrm{R}_{\mathrm{P}}\)$$ has a resistance of $$\(4.0 \Omega\)$$. Use Fig. 3.3 and the values in Table 3.1 to support your answer. . .

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