Question

Identify the changes and state whether energy is absorbed or evolved in the lightning of an electric bulb.

Answer 1

• the lightning of an electric bulb is an example of physical change, as no new substance is formed during this process.
• When the bulb receives this electrical energy, then it converts it into light, and heat energy means energy is evolved.
• At first, the energy transformation takes place in the battery and then the bulb.
• Hence, the transformation of energy in the given situation can be shown as:

$\mathrm{Chemical}\mathrm{Energy}\to \mathrm{Electrical}\mathrm{Energy}\to \mathrm{Light}\mathrm{Energy}+\mathrm{Heat}\mathrm{Energy}.$