Question

1. 1. Record your answers to the following questions as “My Initial Current Flow Concept (Parallel),” before you do the experiment below.
2. Consider connecting a bulb in parallel to a bulb already connected to a battery, creating two junctions A and B as in Figure 2. At the B junction, the wire from the battery provides flow going into the junction. This flow is split between two wires. How does the current going through one of these wires out of the junction compare to current going into the junction? Is it <, >, or =?
3. How would the current coming from the battery going into the A junction compare to the current coming from the battery when just a single bulb is connected (<, >, =)?
   2. In the manner of Steps II.Aand II.Babove, conduct an investigation to answer the research question “How is current flow impacted within a circuit as more bulbs are added in parallel?” Remember that bulb brightness indicates current flow. A completed Experimental Design table is expected.
   3. How does the current through the batter yin a circuit with three bulbs in parallel compare with the current through the battery in a circuit with two bulbs in parallel?  Explain your reasoning.

Answer 1

Sol. A.

If both the bulbs are similar then current flowing through each bulb will be equal.

And according to junction rule, total current flowing into the junction is equal to the total current flowing out of junction.

Hence current going through one of the wire out of the junction is less than the current going into the junction, in fact it will be half of the current going into the junction.

When the single bulb is connected, then the current comming from the battery will be less than ( half) the current comming from battery when two bulbs are connected.

A. How much bulbs are connected in parallel that doesn't matter, because each bulbs will get equal voltage, hence current in each bulbs will be equal each time as more number of bulbs are connected in parallel. But current comming from battery will increase each time.

B. If three bulbs are connected in parallel then Current through the battery will be greater than if two bulbs are connected in parallel.