*Question T6D04:
Which of the following displays an electrical quantity as a numeric value?*  

*Correct Answer is  C: Meter*  

### AI Response: (may contain errors)  

The correct answer to the question is **C: Meter**. 

### Explanation of the Correct Answer:
- A **meter** is a device specifically designed to measure and display electrical quantities, such as voltage, current, or resistance, as numeric values. For example, a multimeter can show the voltage across a circuit in volts or the current flowing through a wire in amperes.

### Explanation of Incorrect Answers:
- **A: Potentiometer**
  - A potentiometer is a variable resistor used to adjust voltage levels in a circuit. While it can be used to measure voltage indirectly, it does not display a numeric value by itself; it requires a meter to read the voltage.

- **B: Transistor**
  - A transistor is a semiconductor device used to amplify or switch electronic signals. It does not measure or display any electrical quantity; rather, it controls the flow of current in a circuit.

- **D: Relay**
  - A relay is an electromechanical switch that opens or closes circuits based on an input signal. It does not measure or display electrical quantities; it simply acts as a switch.

### Summary:
- The only option that directly displays an electrical quantity as a numeric value is the **meter**. 

### Useful Rule of Thumb:
- When identifying devices that measure electrical quantities, look for terms like "meter" (e.g., voltmeter, ammeter) as they are specifically designed for measurement and display.