Electrical energy converts to heat in kettles via resistance

Steps:

• Identify the device: An electric kettle uses electricity from a power source.
• Recall the mechanism: The heating element inside has high resistance, converting electrical energy.
• Apply energy transfer principle: Current flowing through the resistor generates heat via the heating effect.
• Confirm the process: This heat boils the water, with no other energy forms involved.

Why B is correct:

• Electrical to heat follows Joule's law (H = I²Rt), where electrical current produces heat in the resistive coil.

Why the others are wrong:

• A: Chemical to heat occurs in fuel-burning devices, not electric ones.
• C: Electrical to chemical happens in batteries or electrolysis, not heating.
• D: Heat to electrical is in generators or thermocouples, opposite of a kettle's function.

Final answer: B