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Fundamentals of electricity, electronics, components, or theory
7
votes
What are analog and digital signals?
[Normally I wouldn't answer a 3.5 year old question, but none of the existing answers actually answer the submitter's question.]
As I understand it, the question is about how analog and digital (cont …
0
votes
Accepted
How do I find the missing equation?
You need to account for the current through the 4\$\Omega\$ and 8\$\Omega\$ resistors. You can either:
Do as Justin suggests and write a KCL equation for the ground node. This is basically the same …
17
votes
Accepted
When to use a 1/4 Watt resistor vs 1/2 Watt resistor
The watt rating tells you how much current you can run through the resistor before it overheats and burns up. Power is given by:
$$P = I^2R$$
So the maximum current through a 1/4 watt resistor is:
…
0
votes
Accepted
How to read circuit diagram
Schematics like that use a lot of abbreviation. Let me give you the full version:
simulate this circuit – Schematic created using CircuitLab
The little ground symbol at the bottom of your schematic …
12
votes
Accepted
Why does pulsed DC pass through a capacitor?
Zero volts doesn't mean zero current. Assume your circuit looks like this:
simulate this circuit – Schematic created using CircuitLab
When the switch turns on (connects to 10V), current flows …
8
votes
Accepted
What happens if you add a voltage source to the output of an op-amp?
Consider the basic voltage follower:
simulate this circuit
Imagine this circuit with \$V_{in}\$ powered off. \$V_{in}\$ and \$V_C\$ are both 0V. Now we turn on \$V_{in}\$. … But adding resistors doesn't change the basic principle, right?
Now try this. …