Yes.Can i assume the that the currrent going through is 0.03mA?
thanksYes.
So V_a would be 1.8, correct? assuming the V_n ( negative node) is 0?Yes.
Now you can continue through the feedback loop using only Ohms law to calculate all the voltages and currents.
Right value, but what's the polarity?So V_a would be 1.8, correct? assuming the V_n ( negative node) is 0?
Why would it be negative, since PSC says says current entering a a resistor enters a + side, thus making the voltage +.Right value, but what's the polarity?
Which resistor? (You should label all the resistors).Why would it be negative, since PSC says says current entering a a resistor enters a + side, thus making the voltage +.
Yes, it is negative.meaning V_out will be negative? meaning at the node shared among the the resistors its -1.8V. So according so voltage V_a = -1.8V - Ground (0 V) = -1.8V?
It's the yang of positive voltage.i cant grasp negative voltage yet.
Ok, is it right to say that the current at the 40k resistor is flowing from ground to -1.8V? Since current always flows from Higher voltage to negative voltage? If so, how is that possible since there isnt any source to give current. Also, can i visualize all that grounds like if they were interconnected? im sorry im bombarding you with questions, hehehe (also if you have any videos that might help me visualize negative voltage lmk, i understand negative current)Yes, it is negative.
The circuit is a common op amp inverter circuit, meaning the polarity of the output is always opposite the input.
So now that you know Va with its polarity and the current through the 60k resistor, you can calculate the current through the 40k and 30k resistors.
From this you can calculate the output voltage.
It's the yang of positive voltage.
Voltage is always between two nodes, so if one node is positive then the other node is negative with respect to that.
In this case you are measuring voltages with respect to ground, which can be considered the positive or negative node, depending upon the other nodes polarity.
Yes, but it's not a "higher" voltage, it's the positive node (which here is ground).is it right to say that the current at the 40k resistor is flowing from ground to -1.8V? Since current always flows from Higher voltage to negative voltage?
But there is a source.how is that possible since there isnt any source to give current.
Yes, all ground symbols are connected together.can i visualize all that grounds like if they were interconnected?
Thank you so much, you helped a lot!Yes, but it's not a "higher" voltage, it's the positive node (which here is ground).
Current always flows from the positive node to the negative node.
But there is a source.
It's the negative node (which is being generated through the 30k resistor by the op amp output).
A source can be positive or negative.
Try to understand that there is no inherent difference between positive and negative other than to indicate the relative polarity between two nodes.
Yes, all ground symbols are connected together.
There is no voltage difference between them.
Ground is just an arbitrary point that all circuit voltages are referenced to.
It has no other significance.
by Jake Hertz
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by Jake Hertz