- #1
fisico30
- 374
- 0
Hello Forum,
maybe not a new topic but let me ask anyway.
The voltmeter is a simple device used to measure voltage or potential difference. Take a 9 Volt battery. If we connect it to a voltmeter the reading could be either +9 V or - 9 V. What makes one of the leads of voltmeter different from the other one such that the voltage reading can be negative? Current is actually electrons flowing from low to high potential
At times I am still confused about the concept of negative voltage. Given a circuit, we can choose any point and make it the reference point. That means that the voltage at that point can be called zero even if we don't connect that point with Earth ground, correct? Other points in the circuit can be at a positive or negative voltage. Is that all there is to say about negative voltage? We could get by without negative voltage by properly choosing the zero point potential. Why don't we do that?
thanks!
maybe not a new topic but let me ask anyway.
The voltmeter is a simple device used to measure voltage or potential difference. Take a 9 Volt battery. If we connect it to a voltmeter the reading could be either +9 V or - 9 V. What makes one of the leads of voltmeter different from the other one such that the voltage reading can be negative? Current is actually electrons flowing from low to high potential
At times I am still confused about the concept of negative voltage. Given a circuit, we can choose any point and make it the reference point. That means that the voltage at that point can be called zero even if we don't connect that point with Earth ground, correct? Other points in the circuit can be at a positive or negative voltage. Is that all there is to say about negative voltage? We could get by without negative voltage by properly choosing the zero point potential. Why don't we do that?
thanks!