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

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

• A. It varies by component
• B. It is the same through all components
• C. It is zero in all but the first
• D. It depends on branch count

Answer: (B)

In a series circuit, there is only one path for current, so the same amount of charge per unit time flows through every component. That means the current is identical through all parts of the loop, even though the voltage drops across each component can differ based on resistance. This equality of current arises from conservation of charge in a single-path circuit: whatever flows past one element must continue to flow through the next. The other statements don’t fit because there’s no variation of current from component to component in a proper series loop, there’s no open path forcing zero current except in a broken circuit, and branch count isn’t a factor since there are no branches in series.

In a series circuit, there is only one path for current, so the same amount of charge per unit time flows through every component. That means the current is identical through all parts of the loop, even though the voltage drops across each component can differ based on resistance. This equality of current arises from conservation of charge in a single-path circuit: whatever flows past one element must continue to flow through the next.

The other statements don’t fit because there’s no variation of current from component to component in a proper series loop, there’s no open path forcing zero current except in a broken circuit, and branch count isn’t a factor since there are no branches in series.