Exercicis resistències

Avui hem estat practicant exercicis de resistències. Aquest exercici inclouen càlcul de resistències bàsiques en SI i amb valors combinats (KΩ, mΩ,etc…). Hem fet càlculs en paral·lel i en sèrie.

Circuits en sèrie:

         6v
--------!|---[15Ω]-
|                 |
|                ---
|                |5Ω|
|                ---
|                 |
+-------[10Ω]-----+          15Ω+5Ω+10Ω=30Ω

        6v
--------!|----------
|                 |
|                ---
|               |30kΩ|
|                ---
|                 |
+-----------------+  30kΩ =30000Ω

        3v
--------!|--------
|                |
|               ---
|              |2kΩ|
|               ---
|                |
+-------[3Ω]-----+
2kΩ = 2000Ω + 3Ω = 2003Ω

        4v
--------!|----------
|                 |
|                ---
|                |2Ω|
|                ---
|                 |
+-------[10Ω]-----+
10Ω+2Ω=12Ω

Circuits en paralel

        3v
--------!|---------
|                 |
+-------[10Ω]-----+
|                 |
+--------[2Ω]-----+
|                 |
+-------[40Ω]-----+
mcm = 40| 4÷40+20÷40+1÷40 = 25÷40
= 40÷25 = 1,6Ω

+----+--!|--------+
|    |    |       |
|    |   ---      |
|    |   |30Ω|    |
|   ---  ---      |
|   |1kΩ| |      ---
|   ---   |    |0,1kΩ|
|    |    |      ---
|    |    |       |
+----+------------+ mcm = 3000
3÷3000+100÷3000+30÷3000 = 133÷3000 = 3000÷133 = 22,5Ω

        30v
+----+--!|--------+
|    |            |
|    |   ---      |
|    |   |20Ω|    |
|   ---  ---      |
|   |2kΩ| |      ---
|   ---   |    |0,2kΩ|
|    |    |      ---
|    |    |       |
+----+------------+
mcm =2000
1÷2000+20÷2000+10÷2000=31÷2000 = 2000÷31 = 64,5Ω

        5v
--------!|---------
|                 |
+-------[10Ω]-----+
|                 |
+--------[5Ω]-----+
|                 |
+-------[15Ω]-----+ mcm = 30
3÷30+6÷30+2÷30= 11÷30 = 30÷11 = 2,72Ω

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