OHM'S LAW

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THREE PHASE NETWORKS THREE PHASE NETWORKS SERIES CONNECTED RESISTORS SERIES CONNECTED RESISTORS

The magnitude of current flowing in a circuit is dependent upon both voltage and resistance. The relationship among these three electrical properties (current, voltage and resistance) is the important and well-known Ohm's law, which states that the current flow in a circuit is directly proportional to the applied source voltage and inversely proportional to the resistance of the circuit.

 

In mathematical form:

 

 

 

or

 

 

In the following examples, we generally give three solutions for each problem.
  • Numerical solution by TINA
  • Solution by TINA's Interpreter, using Ohm's law
  • Solution by formulas using Ohm's law

 

Example 1

 




Click/tap the circuit above to analyze on-line or click this link to Save under Windows

 

Using Ohm's law:

 



 

The calculated currents confirm that current is directly proportional to the source voltage.

 

 

{Using TINA's Interpreter}

 

I1:=VS1/R1;

 

I1=[2.5]

 

I2:=VS2/R1;

 

I2=[5]

 

I3:=VS3/R1;

 

I3=[10]

 

Example 2

 

In the following example, you can verify that the current is inversely proportional to the resistance.

 




Click/tap the circuit above to analyze on-line or click this link to Save under Windows

 

Using Ohm's law:

 

 



 

{Using TINA's Interpreter}

 

I1:=VS/R1;

 

I1=[5m]

 

I2:=VS/R2;

 

I2=[10m]

 

I3:=VS/R3;

 

I3=[2.5m]

 

Example 3

 

In this example, you can see that the voltage across a resistor is directly proportional to the value of its resistance.

 




Click/tap the circuit above to analyze on-line or click this link to Save under Windows

 

While the detailed formula isn't shown, it is used in TINA's Interpreter to evaluate the example.

 

{Using TINA's Interpreter}

 

V1:=IS1*R1;

 

V1=[10]

 

V2:=IS1*R2;

 

V2=[20]

 

V3:=IS1*R3;

 

V3=[30]

 

Example 4

 

In this example, you can check that the voltage across a resistor is directly proportional to the current flowing through the resistor and to the resistor's resistance.

 




Click/tap the circuit above to analyze on-line or click this link to Save under Windows

 

While the detailed formula isn't shown, it is used in TINA's Interpreter to evaluate the example.

 

{Using TINA's Interpreter}

 

V1:=IS1*R1;

 

V1=[10]

 

V2:=IS2*R1;

 

V2=[20]

 

V3:=IS3*R1;

 

V3=[50]
THREE PHASE NETWORKS THREE PHASE NETWORKS SERIES CONNECTED RESISTORS SERIES CONNECTED RESISTORS

 





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