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Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
Many students who study using our platform have reported that a large number of the practice questions here are very similar to those that appear in real exams. View Courses
A student builds a simple electric circuit with a battery connected to a light bulb. When the switch is closed, the bulb lights up. Which statement best describes the energy transformation in this circuit?
Correct Answer: D. Electrical energy is converted into light and heat energy.
When the switch is closed, electrons flow through the circuit, carrying electrical energy from the battery to the light bulb. Inside the bulb, this electrical energy is transformed into both light (radiant) energy and thermal (heat) energy due to resistance in the filament or LED. The filament glows because of the heat generated, producing visible light. This demonstrates the conservation of energy—energy changes forms but is never lost. Electrical energy becomes radiant and thermal energy, powering illumination and warmth simultaneously.
Why Other Options are Incorrect:
A. Chemical energy is converted directly into light energy misrepresents the energy transformation. Chemical energy from the battery first becomes electrical energy before converting into light and heat. The process is indirect, not a direct chemical-to-light conversion.
B. Light energy is converted into electrical energy describes solar panels, not light bulbs. In this scenario, the circuit produces light from electricity; it does not absorb light to make electricity.
C. Mechanical energy is converted into electrical energy applies to generators or turbines. The circuit does not involve mechanical motion, so there is no mechanical-to-electrical conversion occurring.
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