I came across this video by Khan Academy the other day. It’s one of the best explanations of voltmeters and ammeters that I’ve ever seen. The creator explains in simple, easy to understand terms how and why voltmeters and ammeters are connected the way they are.
Some key points from the video:
- Current is measured with an ammeter, voltage is measured with a voltmeter.
- Voltmeters are always connected in parallel, because you want to measure the voltage between two points.
- Ammeters are always connected in series, this is because you want measure the current going THROUGH the circuit. If you connect the ammeter in parallel you are very likely to damage it.
- Ammeters are made with a very low resistance so that they do not disturb the amount of current that is flowing through the circuit.
- Voltmeters are made with a very high resistance, so that a high current does not flow through them when testing between two points.
- A circle with the letter V inside it is the symbol for voltmeters in a circuit.
- Resistors are identified by the letter R followed by a number.
I hope you take away some useful information from this video, once you get the concepts everything seems to fall into place a lot easier. If you have any queries, feel free to shoot me a message.