Consider the following diagram: Resistor "R" is a

Question

BlackTom AI · Accepted Answer

A shunt resistor is a resistor placed in parallel with another branch so that current can be diverted through it. In the diagram R has both of its terminals connected to the same two nodes as the upper branch (the branch containing r and the meter G), so R is in parallel with that upper branch.

Key concepts:
- Series connection: components share one continuous path so the same current flows through them. A series resistor would be inline with the branch current and not have both ends tied to the same two nodes as another branch.
- Parallel (shunt) connection: components are connected across the same two nodes and therefore share the same voltage; currents divide between the parallel branches.
- Shunt resistor: a low-value resistor placed in parallel with an instrument (e.g., a galvanometer or ammeter) to bypass most of the current and protect or extend the range of the instrument.

Step-by-step reasoning:
1. Label the two horizontal connection points at the ends of the diagram as nodes A and B.
2. The top branch (containing r and G) connects node A to node B. The bottom resistor R also connects node A to node B.
3. Because R and the top branch share the same nodes, they are in parallel. By definition, a resistor placed in parallel to divert current from another branch is called a shunt resistor.
4. In current terms: the total current I_total splits into I_G through the upper branch and I_R through R, with I_total = I_G + I_R, and both branches have the same voltage V = V_A − V_B.

Why other choices are incorrect:
- Series resistor: would be placed in-line with only one path so the same current flows through it and adjacent components; R is not in series here.
- Circuit resistor: not a specific technical term describing this configuration.
- Load resistor: describes the component consuming power in a circuit, but does not describe the parallel/shunting role shown; the diagram specifically shows a resistor used in parallel with the meter, i.e., a shunt.

Therefore, resistor R is a shunt resistor, which matches the provided answer.

Consider the following diagram: Resistor "R" is a单项选择题

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