The voltage source in the circuit below has a current of 1A

The voltage source in the circuit below has a current of 1A flowing out of its positive terminal into resistor R_1. Calculate the current labeled i_2.

Solution

According to kirchoffs current law,

Current enetering a node=Current leaving a node.

Hence;

1 A=i₂+-3 A+7 A

=>i2=1+3-7=-3 A