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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 …
Adam Haun's user avatar
  • 22.3k
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 …
Adam Haun's user avatar
  • 22.3k
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: …
Adam Haun's user avatar
  • 22.3k
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 …
Adam Haun's user avatar
  • 22.3k
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 …
Adam Haun's user avatar
  • 22.3k
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. …
Adam Haun's user avatar
  • 22.3k