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Equivalent Transformation Method

Lecture



Task

  Equivalent Transformation Method

Determine the readings of the circuit devices in Fig. 1 if R1 = 5 Ω, R4 = 8 Ω, R5 = 4 Ω, R3 = 6 Ω, R2 = 2 Ω, E = 100 V. Calculation is carried out by the method of equivalent transformations


Decision:
we write the equation according to the laws of Kirchhoff to verify the calculation of currents

  Equivalent Transformation Method   Equivalent Transformation Method

We turn the scheme, i.e. simplify the circuit and determine the equivalent resistance:

  Equivalent Transformation Method

Determine the source current according to Ohm’s law

  Equivalent Transformation Method

Determine the voltage between nodes A and B, then the currents I2 I3

  Equivalent Transformation Method

Determine the readings of devices:
The ammeter will show the current value I3 I3 = IA = 5 A
Voltmeter readings. Consider the contour of figure 2.

  Equivalent Transformation Method

We write the equation according to the Kirchhoff law for the selected contour:

  Equivalent Transformation Method

Wattmeter readings:

  Equivalent Transformation Method

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Electrical Engineering, Circuit design

Terms: Electrical Engineering, Circuit design