I have the following DC circuit. A cell and a resistor (lightbulb) is serially connected and both ends are grounded. I see the lightbulb is on and hence the current flows.
It is because the electric potential is zero at both grounds. My question is how the earth maintains it. Is it because the earth is conducting?
It cannot be a high resistive conductor, then it forms a closed loop with large resistence and there will be a little current. Then is the earth a almost perfect conductor? Or is there any way to think about how it maintains the zero potential?