Final answer:
To determine the direction of the current in a circuit, you can use Kirchhoff's rules, specifically the junction rule and the loop rule.
Step-by-step explanation:
The direction of the current in a circuit can be determined by following Kirchhoff's rules. When applying Kirchhoff's first rule, the junction rule, you must label the current in each branch and decide in what direction it is going. If the direction of current flow is not obvious, choosing any direction is sufficient as long as at least one current points into the junction and at least one current points out of the junction. When applying Kirchhoff's second rule, the loop rule, you must identify a closed loop and decide in which direction to go around it, clockwise or counterclockwise.