*Question T7D02:
How is a voltmeter connected to a component to measure applied voltage?*  

*Correct Answer is  B: In parallel*  

### AI Response: (may contain errors)  

To measure the applied voltage across a component, a voltmeter must be connected in parallel with that component. 

### Explanation of the Correct Answer:
- **Correct Answer: In parallel**  
  When a voltmeter is connected in parallel, it measures the voltage difference between the two points across which it is connected. This allows the voltmeter to accurately display the voltage that is applied to the component without significantly affecting the circuit.

### Explanation of Incorrect Answers:
- **A: In series**  
  If a voltmeter were connected in series, it would become part of the circuit and would alter the current flowing through the component. This would lead to an inaccurate voltage reading and could potentially damage the voltmeter.

- **C: In quadrature**  
  "In quadrature" refers to a phase relationship, typically used in AC circuits to describe a 90-degree phase difference between voltage and current. It is not a method of connecting a voltmeter.

- **D: In phase**  
  "In phase" also refers to a phase relationship, indicating that two waveforms reach their maximum and minimum values at the same time. Like "in quadrature," this term does not apply to the physical connection of a voltmeter.

### Summary:
- **Voltmeter Connection**: Always connect in parallel to measure voltage accurately.
- **Impact of Series Connection**: Alters circuit behavior and gives incorrect readings.
- **Phase Terms**: Not applicable to voltmeter connections.

This understanding is crucial for correctly measuring voltage in various circuits, especially for the Extra Class exam.