*Question T6A05:
What type of electrical component consists of conductive surfaces separated by an insulator?*  

*Correct Answer is  D: Capacitor*  

### AI Response: (may contain errors)  

The correct answer is **D: Capacitor**. 

### Explanation of the Correct Answer:
- A **capacitor** is an electrical component that consists of two conductive surfaces (plates) separated by an insulator (dielectric). This structure allows the capacitor to store electrical energy in the form of an electric field when a voltage is applied across the plates. The capacitance, which is the ability to store charge, is measured in farads (F).

### Why the Other Choices are Incorrect:
- **A: Resistor**  
  - A resistor is a component that opposes the flow of electric current, converting electrical energy into heat. It does not consist of conductive surfaces separated by an insulator; rather, it is typically made of a resistive material.

- **B: Potentiometer**  
  - A potentiometer is a variable resistor that allows for the adjustment of resistance in a circuit. It has a sliding contact (wiper) that moves along a resistive element, but it does not have the structure of conductive surfaces separated by an insulator.

- **C: Oscillator**  
  - An oscillator is a circuit that generates a periodic signal, often in the form of a sine wave or square wave. It does not refer to a specific component with conductive surfaces and an insulator.

### Useful Formulas or Rules of Thumb:
- The capacitance of a capacitor can be calculated using the formula:  
$$C = \frac{Q}{V}$$  
where:
  - $C$ = capacitance in farads (F)
  - $Q$ = charge stored in coulombs (C)
  - $V$ = voltage across the capacitor in volts (V)

This formula highlights the relationship between charge, voltage, and capacitance, which is fundamental to understanding how capacitors function in circuits.