Mbira
Well-known member
Hi folks,
I am trying to better understand impedance. Is it correct to say that impedance is a measurement at a specific point (as opposed to measuring impedance through a point?)
Is impedance generally measured in relation to ground, or is it measured in relation to a previous point?
Reading in wikipedia, they say "high impedance means that a point in a circuit (a node) allows a relatively small amount of current through, per unit of applied voltage at that point. High impedance circuits are low current and potentially high voltage, whereas low impedance circuits are the opposite (low voltage and potentially high current). "
So, in the diagram attached, am I correct in saying:
1) Point A is low impedance because the cathode has low voltage (tied to ground), but there is high current that is flowing to the plate.
2) Ideally Point B should not be seeing hardly any current, and even though the voltage applied to the grid is relatively low, it is still much greater than the current, so it would be high impedance.
3) Point C confuses me because it has high DC and AC voltage and also high current....so what would this stage be considered?
For some reason impedance confuses the heck out of me, so I apologize if these questions seem stupid, but I'm just trying to keep chipping away at this to get it.
I am trying to better understand impedance. Is it correct to say that impedance is a measurement at a specific point (as opposed to measuring impedance through a point?)
Is impedance generally measured in relation to ground, or is it measured in relation to a previous point?
Reading in wikipedia, they say "high impedance means that a point in a circuit (a node) allows a relatively small amount of current through, per unit of applied voltage at that point. High impedance circuits are low current and potentially high voltage, whereas low impedance circuits are the opposite (low voltage and potentially high current). "
So, in the diagram attached, am I correct in saying:
1) Point A is low impedance because the cathode has low voltage (tied to ground), but there is high current that is flowing to the plate.
2) Ideally Point B should not be seeing hardly any current, and even though the voltage applied to the grid is relatively low, it is still much greater than the current, so it would be high impedance.
3) Point C confuses me because it has high DC and AC voltage and also high current....so what would this stage be considered?
For some reason impedance confuses the heck out of me, so I apologize if these questions seem stupid, but I'm just trying to keep chipping away at this to get it.