Which observation supported Volta's conclusion that electricity came from the metals rather than the frog?

Which observation supported Volta's conclusion that electricity came from the metals rather than the frog?

• A. The frog twitch was observed even without metals
• B. The current only flowed in living tissue
• C. The current did not flow in any metals
• D. The silver-zinc pile produced voltage without a frog

Answer: (D)

The main idea here is that electricity can come from the metal pair itself, not just from animal tissue. Volta showed that when you stack different metals with an electrolyte, a voltage appears even if no frog is present. The silver-zinc pile producing voltage without a frog demonstrates that the source of the current lies in the metal-to-electrolyte interactions at the metal surfaces, and not in the frog tissue. This points to the metals as the origin of the electricity, which was Volta’s key argument against the idea that animal electricity alone could generate the current. In other words, if a metal stack can generate a measurable voltage on its own, the frog isn’t necessary for the electrical effect—and that’s exactly what this observation shows.

The main idea here is that electricity can come from the metal pair itself, not just from animal tissue. Volta showed that when you stack different metals with an electrolyte, a voltage appears even if no frog is present. The silver-zinc pile producing voltage without a frog demonstrates that the source of the current lies in the metal-to-electrolyte interactions at the metal surfaces, and not in the frog tissue. This points to the metals as the origin of the electricity, which was Volta’s key argument against the idea that animal electricity alone could generate the current.

In other words, if a metal stack can generate a measurable voltage on its own, the frog isn’t necessary for the electrical effect—and that’s exactly what this observation shows.