Question

4.1.2 quiz: electricity
question 7 of 10
what role does a resistor play in an electrical circuit?
a. it transforms light energy and thermal energy into electrical energy.
b. it stores electrical energy until it can be released by closing a switch.
c. it removes excess electrons from the outer surface of a conducting wire.
d. it transforms the electrical energy of the electrons into other forms of energy.

Explanation:

A resistor is a component in an electrical circuit. Its main function is related to energy transformation. Let's analyze each option:

• Option A: Devices like solar panels (for light - to - electrical) and thermocouples (for thermal - to - electrical) transform light and thermal energy into electrical energy, not resistors.
• Option B: Capacitors store electrical energy, not resistors.
• Option C: Resistors do not remove excess electrons from the surface of a conducting wire.
• Option D: According to the principle of energy conservation in electrical circuits, when current passes through a resistor, due to the resistance, the electrical energy of the electrons is transformed into other forms of energy (such as heat energy in a simple heating resistor).

Answer:

D. It transforms the electrical energy of the electrons into other forms of energy.