To embark on learning what voltage is, I think it's Interchangeably up to this point, but now that we are about So I want to highlight theĭifference between two things that I've used almost Since voltage is proportional to current and resistance and we know the current is the same the voltage across each element is directly proportional to each elements resistance.Ĭlarify something that I've inadvertently done. Since there is one path through all of the elements the current has to be the same through all of them. WIth a series circuit lets look at the current instead of the voltage. Since the Voltage is the same along a conductor it has to be the same across each element in the circuit. In a parallel circuit you have the same conductor connected to the Voltage source and one end of each element of the circuit. The resister in the voltage meter needs to be very high to minimize its effect on what you are measuring. When you put a voltage meter across a potential you are basically measuring the current through a known resistance, since you know the resistance in the meter you know the voltage needed to cause the current. A conductor with no resistance carries the same potential throughout the entire conductor because any difference in potential will be equalized because there is no resistance to the flow of charge.Ī volt meter is just a sensitive current meter in series with a resister a very high resistance. To have an electrical potential difference (voltage) you need to have a separation of charges. ![]() The difference in potential means that a charge at the higher potential has more energy than it does at the lower potential, it is this energy that is used by the circuit. ![]() A ball rolling down the hill doesn't use up gravity and a charge moving along a electric potential doesn't use up that potential. Voltage is an electric potential difference, just like you have a gravitational potential difference between the top and bottom of a hill.
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