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Calculating the power dissipated in a resistor

This week I am presenting the new p OAR fan Multisim in English on facebook premiere and put a little challenge to anyone interested in circuit analysis.

Since resistive circuit in the figure below, what would be the power dissipated in the resistor R4 ?

There are several ways to do this calculation, we use the circuit theory.

us simplify the circuit using series-parallel reductions:

now have a current divider circuit easier. We can find the current flowing through the resistor of 4 ohms using the formula:

Note that these 8 A are the current flow through resistor R2 original circuit, so that we can divide the current between the resistors R3 and R4 :

finally dissipated power R4 is:

Now in Multisim in English can do this c ALCULATION faster using the wattmeter as follows:

Running Multisim simulation would result in Wattmeter :

which agrees with the result previously calculated.

Another method to calculate the dissipated power would place a static probe in Multisim to measure the current in R4 , and from there use the f ormulate for the calculation of power.

Until next time!

Fernando