Earth batteries and different materials

[Idea04]

Would titanium and copper make a better Earth battery than iron and copper?
What will the voltage and current difference be between the two?

 

[berkeman]

Would titanium and copper make a better Earth battery than iron and copper?
What will the voltage and current difference be between the two?

What's an "earth battery"? Have you seen the recent announcement about biodegradable batteries? Is that what you are asking abou?