Electricity: Basic Concepts Review
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- Opposition to charge flow.
- Units: Ohms (Ω)
Current Flow Analogy
Voltage Analogy
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- Use color coding. You should be able to tell the function of the wire / nature of the signal carried just by looking at the color. For example, use RED for +5V and BLACK for GND everywhere.
- *Wires should be just long enough to connect the 2 points on the breadboard. This keeps the circuit to 2D, and you don't have to trace from end to end of a wire to see its connection. Make sure that you expose just enough copper (about 0.7mm), so that there won't be unnecessary unnecessarily bare partswires, and is long enough to go into the breadboard hole and make a connection.
- *Wires should not cross each other, or cross over any chip.
- If you have multiple chips on a board, they (their notches) should point in the same direction.
- Use columns (longer segments / rails) of the breadboard for +5V and GND, on both sides. Make sure that the rails on the two sides are connected to each other. If you have a source of a different voltage level(say, 3.3V in addition to 5V), use another column for that. The GNDs of the two sources should be connected to each other.
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