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Chapter 7: Problem 27

What is the purpose of having fuses or circuit breakers in electric circuits? How should they be connected in circuits so they will be effective?

Short Answer

Expert verified
Answer: The primary purpose of fuses and circuit breakers is to protect electrical equipment and wiring from damage and overheating due to current overloads or short circuits. They should be connected in series with the electrical load in a circuit, typically near the source of the electrical supply, ensuring their effective interruption of current flow in case of an overload or short circuit.

Step by step solution

01

Purpose of Fuses or Circuit Breakers

Fuses and circuit breakers serve as safety devices in electric circuits. Their primary purpose is to protect electrical equipment and wiring from damage and overheating due to current overloads or short circuits. In case of an overload or short circuit, the fuse or circuit breaker interrupts the flow of current, thus preventing any potential hazards or damage to the electrical system and connected devices.
02

Fuses

A fuse is a thin wire made of metal alloys that have a low melting point. It is placed in series with an electric circuit. When the current in the circuit exceeds the rated safe level of the fuse wire, the wire heats up and melts (blows), thus breaking the circuit and disconnecting the flow of current. This action protects the circuit and devices from potential damage.
03

Circuit Breakers

Circuit breakers are essentially switches that can be reset once tripped by an overload or short circuit. They operate automatically and respond to excessive currents in the circuit by opening the circuit, thus interrupting the current flow. Unlike fuses, circuit breakers can be reset manually or automatically after they have been tripped, making them reusable and more convenient for long-term use.
04

Connection of Fuses and Circuit Breakers in Circuits

Fuses and circuit breakers should be connected in series with the electrical load in a circuit, typically near the source of the electrical supply (such as the utility mains) or installation. This placement ensures that the protective device effectively interrupts the current flow in case of an overload or short circuit, offering protection to the wiring and electrical equipment further down the circuit. In summary, fuses and circuit breakers play an essential role in safeguarding electrical circuits and equipment by breaking the circuit in case of an overload or short circuit. Their effective use and placement within an electrical system help prevent potential hazards and damage.

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