When the live wire comes in contact with the neutral wire, current in the circuit abruptly increases. this condition is called

The correct option is B short circuit Explanation for the correct answer: • When a live wire comes in contact with a neutral wire, the resistance of the circuit decreases which increases the current suddenly. • When the current suddenly increases, the wire gets heated and this results in a short circuit. Explanation for incorrect choices: • The power delivered by a circuit will have a certain limit. If any appliance demands more power, the circuit may get heated and may catch fire. This phenomenon is called overloading. • The highest power input allowed to flow through a particular appliance is defined as a power rating. Hence, option B is the correct answer. Q. In an electric iron being used in a household, the plastic insulation of live wire and neutral wire in the connecting cable gets torn. Due to this, naked live wire touches the naked neutral wire directly and the electric fuse of the circuit blows off. (a) What term is used to indicate the touching of naked live wire and neutral wire directly? (b) When the naked wires touch each other directly, what happens to the resistance of the circuit so formed? (c) What happens to the current flowing through the wires under these conditions? ​(d) Which wire connected to the body of an electric iron protects the person using this electric iron from electric shock?

https://phys.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fphys.libretexts.org%2FBookshelves%2FUniversity_Physics%2FBook%253A_University_Physics_(OpenStax)%2FBook%253A_University_Physics_II_-_Thermodynamics_Electricity_and_Magnetism_(OpenStax)%2F10%253A_Direct-Current_Circuits%2F10.07%253A_Household_Wiring_and_Electrical_Safety Expand/collapse global hierarchy • Home • Bookshelves • University Physics • Book: University Physics (OpenStax) • University Physics II - Thermodynamics, Electricity, and Magnetism (OpenStax) • 10: Direct-Current Circuits • 10.7: Household Wiring and Electrical Safety Expand/collapse global location Learning Objectives By the end of the section, you will be able to: • List the basic concepts involved in house wiring • Define the terms thermal hazard and shock hazard • Describe the effects of electrical shock on human physiology and their relationship to the amount of current through the body • Explain the function of fuses and circuit breakers Electricity presents two known hazards: thermal and shock. A thermal hazard is one in which an excessive electric current causes undesired thermal effects, such as starting a fire in the wall of a house. A shock hazard occurs when an electric current passes through a person. Shocks range in severity from painful, but otherwise harmless, to heart-stopping lethality. In this section, we consider these hazards and the various factors affecting them in a quantitative manner. We also examine systems and ...

The correct option is B short circuit The contact of live and neutral wire in a circuit is called short-circuiting. Since the live wire comes directly in contact with the neutral wire, the path for the circuit is shortened and of negligible resistance. Huge current flows in this case and the circuit and appliances get damaged.

Short circuiting: Whenever live and neutral wires come in contact with each other, the incident is called short circuiting. In this case, resistance of a circuit decreases to a very small value. The decreasing of resistance increases the current. Due to this increased current, the wires get heated. This extreme heat may cause fire in the building. Overloading: Every supply has a capacity to bear a maximum load, i.e., the power that can be supplied has a limit. Sometimes, the number of appliances which are switched on at the same time have power more than the capacity of the line. This is called overloading. In this situation, wires of the supply get heated due to extremely large current flowing through them and the circuit may catch fire. To avoid this fire, we use an electric fuse in the circuit.

Here's a somewhat simple way of looking at it; All circuits, whether DC (battery) or AC (household mains) require a flow of electricity around a loop (preferably including a load otherwise its a short circuit). So the power source will have 2 wires, current flows out of one, round the circuit, through the load, and back to the power source via the other wire. For a DC supply the convention is to call one + and the other - . Current is the flow of electrons. They move from the - to the + (electrons are negatively charged so anything positive will attract them). For an AC supply there is no + or - because it changes directions e.g. 50Hz AC changes 50 times a second, that's why its called "Alternating Current". But you still need the loop, the circuit, hence 2 wires live and neutral. For me (UK) it's 230V nominal a.c voltage on household mains. That's the voltage between the live and the neutral. For reasons of safety one side of the supply is held at (or exceptionally near to) the potential of the earth. It we didn't tie it down you could have, with respect to earth, say, 1230V on the live and 1000V on the neutral,still 230V on the circuit so everything works the same BUT exceedingly dangerous if you touch either conductor and very demanding on the insulation to stop current leaking to earth, the metal of your cooker or your fingers on the light switch. So we tie it down, one end of the ac supply is "earthed" (somewhere in the supply system) and by convention the wire which ...

This is my current(and most probably very incorrect) picture of how electricity comes in my house. What I think of this picture is that, the transformer produces current in my house circuit (by induction), and that current is Alternate Current since the direction of current is changing through both coils continously. Now, how are Live and Neutral Wires different things? I mean current flows in both directions at 50Hz, so clearly both wires are 'live wires' in practice. But, in household circuits the neutral wire apparently doesnt have that much potentail as the live wire. How is that possible? Is my picture missing some electrical components? Is my understanding missing some conceptual components? Edit : I have added another picture, and another question arises, that if neutral is connected to the ground, then does it mean that when current flows through the circuit, ground and neutral wire both 'provide' electrons (as in their electrons get involved) which move/flow through the circuit? Edit 2: I have added a GIF (very lazily made one). What I want to ask is that, are Earth and Neutral wire both contributing electrons as I have shown in the GIF? i.e Is earth also alternating with our whole cicuit? What should I change/add in the circuit's animation? $\begingroup$ @RohitShekhawat After your last update, I do feel EE.SE is a better match. When you start getting into ground effects, the "physics laws" definitions get complicated quickly. As you've probably noticed in my last...

Before attempting any kind of home DIY electrical work, you need to fully understand what to expect. According to the Electrical Safety Foundation International (ESFI), there are Basic Residential Electrical Service In any junction box or outlet box in your home, you’ll find a rainbow of wires that power the various aspects of your appliances. This can prove to be pretty overwhelming. In most modern construction, you’ll find a minimum of three types of wiring: live wires, neutral wires, and ground wires. Live wires Live wires carry the power from the source to a switch or appliance. These wires power the electrical demand or load at various locations throughout your home. These may be light switches, electrical outlets, or junction boxes for light fixtures. The electrical source is ultimately the electrical panel in your home, and any live wire may connect directly to the circuit. It may also connect “upstream” to another switch or junction box. Wherever it’s fed from, this live wire carries a Another fact to understand is that the live wire, or hot wire, is always carrying an electrical current as long as it’s connected to the power source. Neutral wires For the electrical distribution system to work in your home, the current has to complete a circuit. The neutral wire carries the electricity back to the power source. It completes the circuit by directing the current to a ground or busbar, normally located at the electrical panel. Once the power is “used” at the demand po...