Measurement #3: Light bulbs in complex connections (Fig. 6) R2 R1 RA R3 Vs A DMM 5VI Figure 6 Bulbs in complex connections 1. Check that the DC power supply #1 is off. Connect the circuit shown in Fig. 6. 2. Turn on the DC power supply #1. 3. Record the measured current and observed bulbs' brightness in Table 3. 4. Turn off the DC power supply #1. 5. Repeat steps 1 to 4 with a change: use DC power supply #2 (HY152A) and set the output voltage to Vs = 10V. 6. Repeat step 5 with a change: remove light bulb #1 from its socket and keep the other three light bulbs in their original places.Questions on Measurement #3: 1. With all 4 bulbs are in circuit (Fig. 6), use the data in Table 4 explain why bulbs #2 and #3 are dimmer at Vs = 5 V than at Vs = 10 V. 2. Using the measured data of current in Table 3 and the data in Table 4 explain: (a) why bulbs #1 and #4 are brighter than bulbs #2 and #3 at both Vs = 5 V and 10 V when all the 4 bulbs are in circuit; 22(b) why bulbs #3 becomes as bright as bulb # 1 and #4 after bulb #2 is removed (all other bulbs are remained in the circuit)