In a series circuit, which statement is true about the current through each component?

In a series circuit, which statement is true about the current through each component?

• A. It varies with each component
• B. It is the same through all components
• C. It depends on the color code
• D. It is zero for some components

Answer: (B)

In a series circuit, the same current flows through every component because all elements share a single path for charge to travel. The current is determined by the total voltage and total resistance, I = V / R_total, but it stays the same through each component as the charge that leaves one element must enter the next. The color code only tells you resistance values, not the current, so it doesn’t set the current. A zero current would mean the circuit is open or the source is not applying voltage, which isn’t the case in a functioning series loop. If you imagine a 12 V source with two resistors in series, the current is the same through both (I = 12/(R1+R2)), while the voltage drops differ according to each resistor’s value.

In a series circuit, the same current flows through every component because all elements share a single path for charge to travel. The current is determined by the total voltage and total resistance, I = V / R_total, but it stays the same through each component as the charge that leaves one element must enter the next. The color code only tells you resistance values, not the current, so it doesn’t set the current. A zero current would mean the circuit is open or the source is not applying voltage, which isn’t the case in a functioning series loop. If you imagine a 12 V source with two resistors in series, the current is the same through both (I = 12/(R1+R2)), while the voltage drops differ according to each resistor’s value.