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Q. 7

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
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Short Answer

Both batteries in FIGURE Q27.7 are ideal and identical, and all lightbulbs are the same. Rank in order, from brightest to least bright, the brightness of bulbs a to Explain.

The rank in order, from brightest to least bright light bulb is

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Step by Step Solution

Step 1: Concept Introduction

The brightness of the bulb depends upon the amount of energy per second dissipated as light through the bulb when current pass through it.

The equation for the power of the bulb is,

Here, is the current in the circuit and is the resistance of the bulb.

Step 2: Explanation

An ordinary light bulb dissipates surprisingly little power, in comparison with bulbs and . Both bulbs b and c have a resistance that doubles that of an individual bulb.

To make sure you are convinced, let us point out that the power dissipated in a resistor when the potential difference is given is,

Therefore, we can conclude that both bulbs and dissipate the same amount of power. Due to their identical currents and resistances, following can be concluded.

The rank is,

Step 3: Final Answer 

Hence, the rank in order, from brightest to least bright light bulb is

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