Question

which of the following devices converts electrical energy into useful thermal energy?

gas burner
hot plate
motor
generator

Explanation:

Analyze the energy transformation of each device

• Gas burner: Converts chemical energy stored in gas into thermal energy and light energy through combustion.
• Hot plate: Plugs into an electrical outlet and uses electrical energy to heat up its surface, converting electrical energy into useful thermal energy.
• Motor: Converts electrical energy into mechanical (kinetic) energy.
• Generator: Converts mechanical (kinetic) energy into electrical energy.

Identify the correct device

• The question asks for a device that converts electrical energy into useful thermal energy.
• The hot plate is the only device shown that takes electrical energy as input and produces useful thermal energy as its primary output.

Answer:

• Gas burner
• Hot plate (Correct answer)
• Motor
• Generator