Question

1. Is the current through the power supply and each bulb (in Table 2) increasing or decreasing with increasing the number of bulbs in Fig. 5 (a) to Fig. 5 (d)? Why

2. Is there any correlation between the current through each bulb and observed bulbs' brightness? Why?

3. Are the lights at your home connected in parallel? Why?

4. The maximum output current from the DC power supply #1 is 2 A. What is the maximum number of light bulbs (used in the experiment) that can be connected in parallel with the DC power supply #1? What will happen if more than 10 such light bulbs are connected in parallel with the DC power supply #1?

8. Repeat steps 1 to 4 for circuit shown in Fig. 5(d) but with one bulb is removed from its socket. Table 2 DMM reading and observed bulbs' brightness for the circuits in Fig. 5 Source voltage Cases DMM Current Current Observed reading tgh through Brightness power each bulb supply Fig. 5(a) Fig. 5(b) Fig. 5(c) Fig. 5(d) Fig. 5(d) but with one 637 i hiah 2 light bulb removedx Questions on Measurement #2: 1. Is the current through the power supply and each bulb (in Table 2) increasing or decreasing with increasing the number of bulbs from Fig. 5 (a) to Fig. 5 (d)? Why? 2. Is there any correlation between the current through each bulb and observed bulbs' brightness? Why? 3. Are the lights at your home connected in parallel? Why? 4. The maximum output current fromthe DC power supply #1 is 2 A. What is the maximum number of light bulbs (used in this experiment) can be connected in parallel with the DC power supply #1? What will happen if more than 10 such light bulbs are connected in parallel with the DC power supply #1? Measurement #3: Light bulbs in complex connections

I need help answering these 4 post-lab questions. Any help would be very much appreciated.

Thank you

Answer 1

"On increasing the number of bulbs the current through the power supply "" increases"" because all the bulbs are connected in parallel so they draw their own current to glow as a result the current through the power supply increases. While the current in each bulb remains nearly same because ideally if a large number of appliances are connected in parallel then each will draw their own current independently we can see this easily from table. (2) rightarrow Power of a bulb is defined as p = V times I because voltage is constant through each bulb so P proportionalto I so brightness is proportional to the current through the bulb. (3) yes, all appliances in our home are connected in parallel because if appliances are connected in series then each appliances can not be switched on/off independently. Also we can not use appliances of different power rating with series connection. (4) Maximum output current = 2A from the table "