In a series circuit, what quantity is shared between components?

In a series circuit, what quantity is shared between components?

• A. Current
• B. Power
• C. Potential difference
• D. Resistance

Answer: (C)

In a series circuit, the current is the quantity that is shared among all components. There is only one path for the current to flow, so the same amount of charge passes through each element one after another. That means the current that leaves the source must flow through every component in turn. The voltage, on the other hand, is split among the components. Each element drops a portion of the total supply voltage proportional to its resistance, and those individual voltages add up to the total voltage provided by the source. For example, two resistors in series with a 9 V source have a single current flowing through both; if their resistances are 2 Ω and 3 Ω, the total is 5 Ω, so the current is 9/5 = 1.8 A. The voltage across the first resistor is 1.8 × 2 = 3.6 V, and across the second it’s 1.8 × 3 = 5.4 V; these sum to 9 V. So the key idea is: current is the same through every component in a series circuit, while voltage is shared (split) among them.

In a series circuit, the current is the quantity that is shared among all components. There is only one path for the current to flow, so the same amount of charge passes through each element one after another. That means the current that leaves the source must flow through every component in turn.

The voltage, on the other hand, is split among the components. Each element drops a portion of the total supply voltage proportional to its resistance, and those individual voltages add up to the total voltage provided by the source. For example, two resistors in series with a 9 V source have a single current flowing through both; if their resistances are 2 Ω and 3 Ω, the total is 5 Ω, so the current is 9/5 = 1.8 A. The voltage across the first resistor is 1.8 × 2 = 3.6 V, and across the second it’s 1.8 × 3 = 5.4 V; these sum to 9 V.

So the key idea is: current is the same through every component in a series circuit, while voltage is shared (split) among them.