*Question T5D14:
In which type of circuit is voltage the same across all components?*  

*Correct Answer is  B: Parallel*  

### AI Response: (may contain errors)  

In a parallel circuit, the voltage across all components is the same. This is a fundamental characteristic of parallel circuits.

### Explanation of the Correct Answer:
- **Parallel Circuit**: In a parallel configuration, each component is connected directly to the voltage source. Therefore, the voltage across each component is equal to the source voltage. This means that if you measure the voltage across any component in a parallel circuit, it will be the same as the voltage across any other component.

### Why the Other Choices are Incorrect:
- **A: Series**: In a series circuit, the voltage is divided among the components. The total voltage is equal to the sum of the voltages across each component. Thus, the voltage is not the same across all components.
  
- **C: Resonant**: A resonant circuit is a specific type of circuit that can be either series or parallel. In a series resonant circuit, the voltage is not the same across all components, and in a parallel resonant circuit, while the voltage across the resonant components may be the same, this is not a defining characteristic of resonant circuits in general.

- **D: Branch**: The term "branch" refers to a part of a circuit where components are connected. It does not specify whether the components are in series or parallel. Therefore, it does not imply that the voltage is the same across all components.

### Useful Rules of Thumb:
- In **series circuits**: 
  - Total voltage ($V_T$) is the sum of individual voltages ($V_1 + V_2 + ... + V_n$).
  
- In **parallel circuits**: 
  - Total voltage ($V_T$) is the same across all components: 
  $$V_T = V_1 = V_2 = ... = V_n$$

Understanding these concepts will help you correctly identify the characteristics of different types of circuits on the exam.