5. Repeat steps l to 4 with a change: use DC power supply #2 (HY 152A) and set t

Question

5. Repeat steps l to 4 with a change: use DC power supply #2 (HY 152A) and set the output voltage to = 10V 6. 7, 8. 9. Repeat in their original places. Repeat step 5 with a change: remove light bulb #2 from, its socket and keep the other three light bulbs in their original places Repeat step 5 with a change: remove light bulb #3 fronm its socket and keep the other three light bulbs in their original places. Repeat step 5 with a change: remove light bulb #4 fromh its socket and keep the other three light bulbs in their original places. step nwith a change: remove light bulb #1 from its socket and keep the other three light bulbs Table 3 DMM reading and observed bulbs brightness for the circuits in Fig. 6. DMM reading .3ao A Source Cases | All 4 light bulbs are in circuit Light bulb #1 is removed Light bulb #3 is removed | bulb #1 bulb #2 T bulb #3 | bulb #4 ~SV All 4 light bulbs are init9CAorlono ibight Light bulb #4 is removed Questions on Measurement #3: 1. Although currents I2 and Ii are not measured directly you can find the values of I2 and I, from the measured current in Table 3 (assume all the four light bulbs have the same resistance). Find the values of I: and Is (with all the four bulbs in the circuit) at (a) v, =5V: 12-1a2(mA), 13-100 (mA) (b) Vs = 10V: 12 =-(mA), 13-92(mA) Using these data explain why bulbs #2 and #3 are brighter at V,-10 V than at V-V. 2. Using above data and the measured data of current in Table 3 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 (b) why bulbs #3 becomes brighter after bulb #2 is removed (all other bulbs are remained in the circuit). 3. Can the lights at your home be connected as shown in Fig. 6? Why? No

Explanation / Answer

2. a.

From the given data we can see that

removing light bulb 1 or 4 from the circuit breaks the circuit and none of the bulb is lit anymore

the other two bulbs 2,3 when removed only effect each other

this means that the bulbs 1 and 4 are places as such that all the current of the circuit passes through them

bulbs 2 and 3 are placed in the different branch of the circuit such that ther eis path for current to flow from bulb 1 and 4 into a dirfferent branch as well and that is why the bulbs 1 and 4 are still lit when any of the bulbs 2 and 3 is removed

hence

as all of the curtrnet of the circuit pases through bulb 1 and 4, hence they are more brightly lit

b.

after removing bulb #2, the overall resistance of the network decreases

this increases current passing through bulb 3 as well and hence makes it lit more brightly

3. the lights in our hone cannot be connected this way as we need all lights to function independendt of each other and not in a way where brightness of one is affected by another

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