When gold and silver rings receive an electric arc and turn molten, which form of energy is primarily responsible for this change?

• A. Chemical energy released from the metals
• B. Radiant energy absorbed by the rings
• C. Electrical energy converted to thermal energy
• D. Mechanical energy applied to the rings

Answer: (C)

Verified step by step guidance

1. Identify the process described: gold and silver rings are heated by an electric arc until they become molten.
2. Understand that an electric arc produces energy primarily in the form of electrical energy, which is then converted into heat (thermal energy).
3. Recognize that the heat generated raises the temperature of the metal rings, causing them to melt.
4. Eliminate other energy forms: chemical energy is not released here because no chemical reaction occurs; mechanical energy is not applied; radiant energy is present but is a result of the electric arc, not the primary cause of melting.
5. Conclude that the primary form of energy responsible for melting the rings is electrical energy converted into thermal energy.