Practice Quiz

Praxis II General Science

Category - Physics

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Chris is wiring up a new radio, and he connects 3 resistors in series. If these 3 resistors are in a closed circuit, which of the following statements is true about the current passing through each of them?
  1. The first resistor has the most current.
  2. The third resistor has the most current.
  3. The current passing through each resistor is the same.
  4. The current decreases exponentially from the 1st to the 3rd resistor.
  5. There is only current through the first resistor. Afterward, the current is zero.
Explanation
Answer: C - In a closed circuit, current passing through a series of resistors is the same for each resistor. This is because current can be thought of as water (in an imaginary sense). Despite resistance in pipes, the amount of water that flows through a closed pipe must always be the same. This analogy can also be applied to current ‘flowing’ through wires.
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