How do I calculate the voltage drop of the street light circuit?

When I calculate the voltage drop, should I use the entire load or calculate the voltage drop after every LED light?

You can start by using the entire load to calculate the voltage drop. If you want a more accurate result, you should divide the circuit and calculate the specific current and voltage drop. The voltage drop of each lamp will be the sum of the upstream values.

More reading: Smart Street Lights Control System Solution

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