In a series circuit, how does the current behave?

In a series circuit, how does the current behave?

• A. The current is the same through all components.
• B. The current decreases at each component.
• C. The current increases at each component.
• D. The current is zero if any component is off.

Answer: (A)

In a series circuit, charge has only one path to flow, so the same current travels through every component. The current is the rate at which electric charges move, and with a single loop there’s a constant amount of charge passing by each point per second, meaning the current that leaves one element must equal the current entering the next. The total resistance adds up, and the current is set by the supply voltage through Ohm’s law, but the key behavior is that the current stays the same throughout the entire circuit. If a component is off and the path is opened, no current can flow anywhere. The current does not increase or decrease as it moves through the components in a closed series loop.

In a series circuit, charge has only one path to flow, so the same current travels through every component. The current is the rate at which electric charges move, and with a single loop there’s a constant amount of charge passing by each point per second, meaning the current that leaves one element must equal the current entering the next. The total resistance adds up, and the current is set by the supply voltage through Ohm’s law, but the key behavior is that the current stays the same throughout the entire circuit. If a component is off and the path is opened, no current can flow anywhere. The current does not increase or decrease as it moves through the components in a closed series loop.