Electric motors impact almost every aspect of modern living. Refrigerators, vacuum cleaners, air conditioners, fans, computer hard drives, automatic car windows, and multitudes of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy.
The strength of the motor (torque) is determined by voltage and the length of the wire in an electromagnet in the stator, the longer the wire (which means more coils in the stator) the stronger the magnetic field. This means more power to turn the rotor.
The principle of an electric motor is based on the current carrying conductor which produces magnetic field around it. A current carrying conductor is placed perpendicular to the magnetic field so that it experiences a force.
An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft.
An electric motor converts electrical energy into physical movement. Electric motors generate magnetic fields with electric current through a coil. The magnetic field then causes a force with a magnet that causes movement or spinning that runs the motor.
1834 – The first electric motor is madeThis was the first electric motor that had enough power to perform a task and his invention was used to power a small-scale printing press.
The induction motor is one of the most important inventions in modern history. It turned the wheels of progress at a new speed and officially kicked off the second industrial revolution by drastically improving energy generation efficiency and making the long-distance distribution of electricity possible.
The three effects of electric current are:
- Heating effect.
- Magnetic effect.
- Chemical effect.
Answer: The two effects of electric current are; heating effect and magnetic effect.
Electricity is an essential part of modern life and important to the U.S. economy. People use electricity for lighting, heating, cooling, and refrigeration and for operating appliances, computers, electronics, machinery, and public transportation systems.
Four of the major effects of electricity are the magnetic effect, heating effect, chemical effect, and electrical effect or electrical shock. Magnetic effects occurs in some devices such as door bells and buzzers. This devices create sounds because of the magnetic effect.
Electric current is able to create severe burns in the body. The reason is hidden in the power dissipation across the body´s electrical resistance. Shock can cause: cardiac arrest, burns to tissues and organs, muscle spasms, serious effects to the nervous system and other unexpected consequenses.
When an electric current passes through a conductor (like a high resistance wire) the conductor becomes hot after some time and produces heat. This is called heating effect of Electric Current. Example 1. A bulb becomes hot after its use for some time.This is because of heating effect of electric current.
An electrical phenomenon is caused by flow of free electrons from one atom to another. The characteristics of current electricity are opposite to those of static electricity. Wires are made up of conductors such as copper or aluminum. Current flows from positive to negative and electron flows from negative to positive.
Any material that keeps energy such as electricity, heat, or cold from easily transferring through is an insulator. Wood, plastic, rubber, and glass are good insulators.
Most liquids that conduct electricity are solutions of acids, bases and salts.
- Distilled water is free of salts hence it is a poor conductor.
- When salt is dissolved in distilled water, we obtain a salt solution.
- Tap water is a good conductor of electricity as small amounts of mineral salts are naturally present in it.
О The passage of an electric current through a conducting liquid causes chemical reactions. The resulting effects are called chemical effects of currents. О The process of depositing a layer of any desired metal on another material, by means of electricity, is called electroplating.
: a core of magnetic material (such as iron) surrounded by a coil of wire through which an electric current is passed to magnetize the core.
Danish physicist Hans Christian Ørsted's discovery, in 1820, of the magnetic effect accompanying an electric…
The magnetic effect of electric current is known as electromagnetic effect. It is observed that when a compass is brought near a current carrying conductor the needle of compass gets deflected because of flow of electricity. This shows that electric current produces a magnetic effect.
In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.
When electric current is passed through a conductor, it becomes very hot due to which it emits light. This is called lighting effect of electric current. For example: electric bulbs, fluorescent lamps, etc.
A current-carrying wire or coil can exert a force on a permanent magnet. This is called the motor effect. The force increases if the strength of the magnetic field and/or current increases.
A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit. By reversing the current direction in the rotating windings each half turn, a steady rotating force (torque) is produced.
On DC and most AC motors the purpose of the commutator is to insure that the current flowing through the rotor windings is always in the same direction, and the proper coil on the rotor is energized in respect to the field coils.
When an electric current flows through the coil, a force is exerted on the coil, causing it to spin. The diagram shows: the coil of wire has an electrical current running through it because it is connected to the cell. this generates a magnetic field around the wire.
ANSWER: In order to make the motor spin faster or slower you must increase or decrease the strength of the magnetic field. This is done by either changing the amount of current running through the motor or varying the distance of the permanent magnets from the motor.
To increase the turning effect of the coil in the motor:
- Insert a soft Iron core or cylinder into coil - to concentrate the magnetic field lines.
- Increase the number of turns in the coil.
- Increase the current in the coil.
For making a strong electromagnet, the material of the core should be. The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when current is flowing through the coil.
Electric motors are found in many household devices e.g. tumble dryers, washing machines, vacuum cleaners, electric knives, food mixers, hair dryers and electric toothbrushes. A coil of wire carrying a current in a magnetic field experiences a force that tends to make it rotate.
Current is directly proportional to magnetic force for a straight current carrying conductor in a uniform magnetic field. So the force is directly proportional to the size of the current. If the current is increased by five times the force will also increase by five times.
