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Calculation of power in university circuits. Question 1-5 (a) Does 2A under the current source refer to the current in the circuit or the current emitted by the current source?
In figure 1-5 (a), that 2A represents the current of the current source, but this circuit has only one loop, so the current everywhere is equal to this.
Power on resistor =I? R=2？ ×5=20 W (consumption)
Power-on of voltage source =U×I= 15×2=30 W (sent)
Power emitted-power consumed = power absorbed
So: the power on the current source =30-20= 10 W (absorption)