# What is the reason for still measuring a current in the circuit even when the potential difference is zero? Please explain using concepts from Physics II.

Q: What is the reason for still measuring a current in the circuit even when the potential difference is zero? Please explain using concepts from Physics II.

MY ANSWER:

Current will flow as long as there is a difference in potential.

Ohm's Law applies. I = V/R As long as V is greater than zero there will be finite I.

The reason is voltmeter has very high resistance and an ammeter has a very small resistance. when we connect voltmeter parallel to the circuit element the current through voltemeter is approximately zero. so, it reads zero voltage.

But the current flowing through the circuit element passes through the ammeter. so, ammeter reads that current.

TEACHER RESPONSE: If there's still current being measured when no signal is being applied, where do you think that residual current is coming from?

can you please fix my answer