What is Fuse and its uses?
What is a Fuse? Fuses are sacrificial devices used to protect much more expensive electrical components from the damaging effects of overcurrent. They consist of a low-resistance metal or wire that is used to close a circuit.
What is the principle of fuse?
An electric fuse is based on the principle of heating effect of electric current. It is made up of thin metallic wire of non-combustible material. A fuse is always connected between the ends of the terminal in a series connection with the circuit.
What does a fuse do in a circuit?
A plug fuse is a safety device which is connected into an electrical circuit to prevent excessive current flow during fault conditions. Upon overload, the wire fuse element heats up and melts, or blows with a resounding bang, interrupting and cutting off the current flow.
What is the function of fuse in a domestic circuit?
Answer: The fuse in a circuit prevents over heating of the wires and appliances due to excess transfer of electric current and melts when more current passes through it. It is connected in series in domestic circuits.
What are the rating of fuse wire used in domestic circuit?
Answer: In household circuit system, two type of circuit are used . One of 15 A for appliances with higher power ratings and the other of 5A ratings for bulbs etc.
What is the function of fuse in an electric circuit class 10?
In the field of electrical engineering, a fuse is a device that provides over-current protection to the functional electrical circuit.
Can any wire be used as a fuse wire Why?
No, we cannot use copper wire as fuse wire because the melting point of copper is higher and resistance is low and hence, current can flow through it without melting it or breaking the circuit and it can’t be limited. Want to top your physics exam ?
What is a fuse short answer?
Fuse is a piece of wire of a material with a very low melting point. When a high current flows through the circuit due to overloading or short circuit, the wires gets heated and melts. As a result, the circuit is broken and current stops flowing. Answer verified by Toppr.
Why fuse is not used in neutral wire?
Because the fuse can disconnect the circuit only when the excess current flows completely through the neutral. Since, neutral is not a live conductor coming from the source, disconnecting a neutral line can only open the current path through neutral. But, the live phase still carries the charge.
Why the fuse is always connected in series?
Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s). The most common device in use for overcurrent protection in high-current circuits today is the circuit breaker.
Can you fuse a neutral?
A single fuse in the neutral conductor provides protection for neutral-to-phase faults, but not for phase-to-ground faults. This is one reason why a single fuse in the neutral is not permitted.
Where is fuse wire connected?
The fuse wire is always connected in the live wire of the circuit because if the fuse is put in the neutral wire, then due to excessive flow of current when the fuse burns, current stops flowing in the circuit, but the appliance remains connected to the high potential point of the supply through the live wire.
Why fuse is not connected in parallel?
A fuse is nothing more than a short length of wire designed to melt and separate in the event of excessive current. Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s).
Why is the fuse wire fitted in a porcelain casing?
Complete answer: The fuse wire is fitted in porcelain casing because porcelain may be an insulator of electricity. Porcelain may be an excellent insulator and therefore if the part of the holder we touch is away from the eager beaver then there’s no damage from getting any electric shock.
What is fuse wire?
Answer: A fuse wire is a safety wire connected in series with the live wire, in case of any large current supply or malfunctioning in the electric connections it melts and breaks the electric circuit. Characteristics: High resistivity. Low melting point.
What are the 3 types of fuses?
Different Types of Fuses – Constriction, Working & Characteristics
- DC Fuses.
- AC Fuses.
- Cartridge Fuses.
- D – Type Cartridge Fuse.
- HRC (High Rupturing Capacity) Fuse or Link Type Cartridge Fuse.
- High Voltage Fuses.
- Automotive, Blade Type & Bolted Type Fuses.
- SMD Fuses (Surface Mount Fuse), Chip , Radial, and Lead Fuses.
What fuse to use?
Plugs for appliances rated between about 700 watts and 3000 watts (the maximum rating of a wall socket) should be fitted with a 13-amp fuse (coloured brown). For example: 13A Fuse – Washing machine, dishwasher, microwave, kettle, toaster, iron.
Which wire is used in fuse?
The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin. An alloy of lead and tin is used for small current rating fuses….Fuse Wire Materials.
| Metal | Zinc |
|---|---|
| Melting Point in Celsius | 419 |
| Specific Resistance | 60 |
| Value of Fuse constant k for d in mm | – |
Is Nichrome used in fuse?
nichrome has a high melting point due to which it is not used as a fuse wire .. if it will be used then the current through circuit will flow and can damage our home appliances….
Can a fuse be replaced by a wire?
No, replacing a fuse with a wire is not suggestible. Hence when the flow of current in circuit is more than normal the fuse wire starts to heat and melts thereby disconnecting the circuit but with a normal wire this will not happen and the electrical appliances are compromised.
What are the two characteristics of fuse wire?
Characteristic properties of a fuse wire: (i) It is made up of an alloy of lead and tin. (ii) It has high resistivity and low melting point.
What are characteristics of fuse?
Fuse characteristics
- Fuse type. Fuses are identified by 2 letters, according to their application category.
- Rated currents and voltages. The rated current can cross a fuse indefinitely, without triggering either fusing or any excessive temperature rise.
- Conventional Non-fusing And Fusing Currents.
- Operating zone.
- Breaking Capacity.
Which characteristic is not suitable for a fuse wire?
A fuse wire should not have high resistance or low resistance. That is the fuse thickness increases with the current rating.
Do fuses have high resistance?
Answer. A fuse wire has high resistance and low melting point because when the high current passing through the circuits a fuse will resist the high current and protected the other electric appliances being damaged. A fuse wire melts easily if a high current passes through the circuit.
Should a fuse have resistance?
Place one of the multimeter leads on one end of the fuse. Place the other lead on the other end of the fuse. If the reading is between 0 and 5 Ω (Ohms), the fuse is good. A higher reading indicates a bad or degraded fuse.
Why does fuse have high resistance?
A fuse wire should have a high resistance so that according to (1), a lot of heat is generated and it is easier for the fuse wire to reach its melting point. Also, a high resistance decreases the current flowing in the circuit than what would have been in the absence of it.
Is fuse a low resistance?
Answer: (3) A fuse wire should be highly resistant and have a low melting point, toprevent the current from passing higher than the specified value. Whenhigh current passes through it due to the heat produced, the low melting point will make it split.
Why fuse has more resistance and low melting point?
A fuse wire should have high resistance and low melting point. So that it prevents current higher than the prescribed value to pass . Low melting point will let it to break when high current passes through it because of the heat generated.
Is fuse used for small current flow only?
Hint: The main objective of using fuse wire in any electric circuit is to provide protection against short circuit or overload current. Fuse wire must have high resistance and low melting point. Fuse is used for small current flow only.
What are the essential requirements of the fuse wire?
The fuse wire is made of zinc, copper, silver, aluminum, or alloys to provide stable and predictable characteristics. Fuse should be of low resistance and low melting point as per the requirement current rating for overcurrent protection.