Q. 8 Both batteries in FIGURE Q27.8 a... [FREE SOLUTION]

Chapter 27: Q. 8 (page 761)

Both batteries in FIGURE Q27.8 are ideal and identical, and all lightbulbs are the same. Rank in order, from brightest to least bright, the brightness of bulbs a to c. Explain.

Short Answer

Expert verified

All three bulbs are connected directly to the positive and negative terminals of the batteries so have the same potential difference across them, thus the same current and brightness.

$a = b = c .$

Step by step solution

Concept Introduction

As the voltage drops across each bulb, the light bulbs glow, and the current flowing through them forms the current flowing in the battery.

Explanation

Draw the first figure as follows:

From the above figure, the bulb $a$ is connected to the battery. Here, the entire circuit will have the same voltage and this voltage is passed through the bulb $a$ .

Draw the second figure as follows:

In then second figure, the bulbs $a$ and $b$ are connected in parallel to the battery. The bulbs that are connected in parallel in a circuit possess same amount of voltage among them. Hence, the voltage across two bulbs $a$ and $b$ are same.