Two 5-ohm resistors in series total resistance?

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Multiple Choice

Two 5-ohm resistors in series total resistance?

Explanation:
In a series circuit, resistances simply add together. The same current flows through both resistors, and the total opposition to current is the sum of each resistor’s resistance. So two 5-ohm resistors in series give 5 + 5 = 10 ohms. The other numbers don’t fit the series rule: 5 ohms would occur if only one 5-ohm resistor were present (or if the two were arranged in parallel, where their resistances combine differently). 2.5 ohms is the parallel result of two 5-ohm resistors, not series. 20 ohms would require four 5-ohm resistors in series, not two.

In a series circuit, resistances simply add together. The same current flows through both resistors, and the total opposition to current is the sum of each resistor’s resistance. So two 5-ohm resistors in series give 5 + 5 = 10 ohms.

The other numbers don’t fit the series rule: 5 ohms would occur if only one 5-ohm resistor were present (or if the two were arranged in parallel, where their resistances combine differently). 2.5 ohms is the parallel result of two 5-ohm resistors, not series. 20 ohms would require four 5-ohm resistors in series, not two.

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