Why does rubbing the cell increase the brightness of the bulb?

Question:

Why does rubbing the cell increase the brightness of the bulb?

Electrical Current

An electrical current or current is a net flow of electron in a conductor or a wire. Current in a wire can be calculated by getting the voltage and resistance of the wire by using Ohm's law {eq}V = IR {/eq}

Answer and Explanation:


Rubbing the cell increases the temperature thus increases the conductivity of the cell.


Increase in conductivity means more electron flow and increase in current.


Light bulb (that has a filament, brightness is dependent on current) increases its brightness when current increases.


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What is Electric Current? - Definition, Unit & Types

from CLEP Natural Sciences: Study Guide & Test Prep

Chapter 6 / Lesson 7
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