4. The circuit in Fig. 8 consists a DC power supply with Vs =9 , an ammeter A, a voltmeter V, a lamp (L) of resistance R, , two resistors R, and R2 along with two switches S, and S, S2 SI R = 60 M Lamp R2 Is V's =9V Figure 8 Circuit diagram for question #4. There are 4 switch settings for S, and S, which affect the connections of the two resistors R and R, in the circuit of Fig. 8. Switch setting (a): (S, open, S, open) At setting (a) the ammeter reading is I = 0.5 A and voltmeter reading is V, = 3 V . From these given data to find the resistance of R, = 6 2, R2 = 12 n 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. hamasom of () Where VL, I, and P, are the voltage, current and power for the lamp; Is & 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 lamp). Table 7 Calculated VL, IL, PL, Is, PS and comparison of brightness of the lamp at 4 switch settings. Switch setting VL (V) I, (A) PL (W) IS (A) PS ( W ) Lamp brightness (a) (S, open, S, open) (b) (S, open, S, closed) (c) (S, closed, S, closed) (d) (S, closed, S, open)