Equivalent Transformation Method

Task



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



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



Determine the source current according to Ohm’s law



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



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.



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



Wattmeter readings: