Question

Which is the correct energy transformation that occur while a battery lights a bulb?

• A. Chemical energy → Electric energy → Light energy
• B. Electric energy → Chemical energy → Light energy
• C. Light energy → Chemical energy → Electric energy
• D. Light energy → Electric energy → Chemical energy

Answer 1

The correct option is A Chemical energy → Electric energy → Light energy

A battery contains a chemical solution, in which chemical reactions (oxidation and reduction) occur. Electrons/ions move towards the electrodes of the battery. Due to this, the potential drop occurs across the electrodes and thus, the current gets generated. In this way, chemical energy in the solution of the battery is converted to electrical energy and finally to light energy and thus, the bulb glows.

$\text{Chemical energy}\to \text{Electric energy}\to \text{Light energy}$

$\left(Battery\right)\left(\begin{array}{c}Electricity\\ \downarrow \\ \text{Flow of electrons}\end{array}\right)$

Hence, the correct answer is option (a).