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4. The circuit in Fig. 8 consists a DC power supply with V. =91 , an ammeter A, a voltmeter V. a lamp (L) of resistance R, , two resistors R, and R, along with two switches S, and S,. R1 = 60 mm R2 Lamp VS = 9V Figure 8 Circuit diagram for question #4. the circuit of Fig. 8. There are 4 switch settings for S, and S, which affect the connections of the two resistors R, and R, in Switch setting (a): (S, open, S, open) At setting (a) the ammeter reading is 1 = 0.5 A and voltmeter reading is V, = 3 V From these given data to find the resistance of R, = 82 , Rx = Switch setting (b): (S, open, S, closed) Switch setting (c): (S, closed, S, closed) Switch setting (d): (S, closed, S, open) Work to be done: (1) Draw circuit diagram for each of above 4 switch settings. (2) From each diagram to calculate the quantities listed in Table 7. Where V1, I, and P, are the voltage, current and power for the lamp; I, & Ps are the current and power for the source. (3) Compare the lamp brightness based on the values of Pr (W) (power dissipated in the lam Table 7 Calculated V , I, , P., I,, P, and comparison of brightness of the lamp at 4 switch sett Switch setting PS (W ) Lamp V. (V) I, ( A) PL (W) IS ( A ) brightne (a) (S, open, S, open) (b) (S, open, S, closed) (c) (S, closed, S, closed) (d) (S, closed, S, open)