A ______ controls the flow of electricity in circuit .

Options

A. switch
B. wire
C. cell
D. bulb

Explanation

To answer the question "A ______ controls the flow of electricity in a circuit," we need to identify the component that performs this function.

### Step-by-Step Solution:

1. **Understanding the Components of a Circuit**:
- A circuit is made up of various components such as batteries (or cells), wires, resistors, and switches. Each of these components plays a specific role in the functioning of the circuit.

2. **Identifying the Control Mechanism**:
- Among these components, the one that specifically controls the flow of electricity is crucial. The flow of electricity can be turned on or off, which is essential for the operation of electrical devices.

3. **Recognizing the Role of a Switch**:
- A switch is a device that can open or close a circuit. When the switch is closed, it allows electricity to flow through the circuit. When the switch is open, it breaks the circuit and stops the flow of electricity.

4. **Conclusion**:
- Therefore, the correct answer to the question is "switch." A switch controls the flow of electricity in a circuit.

### Final Answer:
A **switch** controls the flow of electricity in a circuit.

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