In the same series circuit, what is the current through each resistor?

• A. 0.3 A
• B. 1 A
• C. 0.6 A
• D. 2 A

Answer: (C)

In a series circuit, the same current flows through every component because there’s only one path for the charge to take. What goes into a resistor must come out of it and continue on, so the current doesn’t split or change as it moves from one resistor to the next. Therefore, the current through each resistor equals the total circuit current.

Since the circuit current is 0.6 A, that same 0.6 A flows through every resistor in the series. The other values would require the current to be different in different parts of the loop, which can’t happen in a single-path series circuit.