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Symbol Standart P&ID

    Symbol Standarisation P&ID For Industri Standard piping and instrument symbols are detailed diagrammatic documentation that provides a set of forms & standards for documenting P&IDs and PFDs, including standard shapes for instruments, valves, pumps, heat exchangers, mixers, crushers, vessels, compressors, filters, motors and other connection forms. Here are some symbols on P&ID : So, those are some of the symbols that we will often see when reading piping & instrument diagrams. May be useful.
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Basic Electronic Formulas

Basic Electronic Formulas

Calculating Electric Power


Here are some formulas that we can use to calculate electrical power:

P = V x I .............................................................................................(1)

P = I²  x R ...........................................................................................(2)

P = V² /  R ...........................................................................................(3)

Des :
P = Power (watt)
I  = Current (A)
R =  Resistent (Ohm)
V = Voltage (V)

Formula number 1 can be used to find power if the voltage and current are known.
We can use formula number 2 to find power with known resistance and current.
We can use formula number 3 to find power if we know the voltage and resistance.

Problem example1 :

The above is an example of a series circuit, calculate the total power?

Answer : 

Is known :
R1 = 1 ohm
R2 = 3 ohm
R total = R1 + R2 = 1 ohm + 3 ohm = 4 ohm
V = 6 V

Asked :
P = ... ?

Answer :
P =  V² /  R
   = 6² /  4
   = 36 / 4
   = 9 watt
   
Problem example 2 :

The above is an example of a parallel circuit, calculate the total power?

Answer : 

Is known :
R1 = 4 ohm
R2 = 6 ohm
R total = 1/R1 + 1/R2 = 1/1 ohm + 1/3 ohm = 1,34 ohm
V = 24 V

Asked:
P = ... ?

Answer :
P = V² /   R  
   = 24 ² /  1,34
   = 576 / 4
   = 144 watt

Thus a brief discussion and also some examples of calculations for power in a circuit. Hopefully it's useful.
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