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All electrical devices.
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∙ 12y ago
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When a mineral attracts iron-based materials it is what?
magnetic
What metals are used in magnets?
Most magnetic alloys are based on one or more of the following:ironnickelcobaltHigh field strength modern alloys also contain rare earth metals.
If there were no land on Earth's surface what would the pattern of surface currents look like?
Most of the ocean currents are affected by global winds and the Coriolis effect, which states that the apparent curving of the path from an otherwise straight path is due to the Earth's rotation. The movement of the ocean currents are also affected by the continents: because of global winds and the Coriolis effect, most of the ocean currents want to move a different way than they actually are because they are deflected off of the continents. An example is the South Equatorial Current and the Benguela Current flowing in a circular motion in between the east coast of South America and the West Coast of Africa. If these continents ceased to exist, the directions of the currents would change, based on the global winds in that area and the Coriolis Effect.
How has coal contributed to the green house effect?
All hydrocarbon based fuels add to the "green house effect" by emitting CO2, carbon dioxide. This carbon dioxide causes the Earth's atmosphere to refract sunlight in such a way that it actually warms the planet a little more.
What is current and types of current?
Wow, this could take all day depending on how deep you want to go! Current is the 'Juice' that flows through an electrical circuit. Current has been compared to water for explanation purposes. Voltage is the pressure that a system has, and current is the amount of water that flows through the system. A water tower is 100ft above the ground. Let's say that it has 100ft of pressure. This would be analogous to the potential difference (voltage). Water can flow through the pipes at 10 gallons per minute, in Electro-Speak; this would be the current (amps, amperage), particles of electricy per time unit, (particles/sec, particles/millisecond, etc.). In your house you have a lamp that operates a 120 Volts AC (alternating current, as opposed to DC - Direct Current like that in your car battery). The lamp is 120 watts (for ex.) therefore according to Ohm's law, the First Commandment of Electricity), the lamp draws 1 amp. Current (I) = Power (watts)/Voltage, Therefore 10 120w lamps = 1200 watts (like a hair dryer) draws 10 amps, a 60-watt lamp bulb would draw half an amp (0.5a). Current is also X# Coulombs per second, a coulomb is (whole bunch) of Joules/second. A Joule is a tiny particle of energy.
What are 3 essentials aspect of electric current?
An electric current has three 'effects'. These are (1) heating effect, (2) chemical effect, and (3) magnetic effect.Any one of these effects can be used to define the unit of measurement for electric current, the ampere.Until around 1947, for example, the 'chemical effect' was used -i.e. the ampere was based on the mass of silver deposited on an electrode during electrolysis.Since then, the 'magnetic effect' has been used -i.e. the ampere is based on the force between two current-carrying conductors, due to their surrounding magnetic fields.
What does a current do?
An electric current is considered to produce three 'effects'. These are itsheating effect,magnetic effect, andchemical effect.The heating effect is made use of in water heaters, stoves, incandescent lamps, etc. It is also responsible for energy loss, as supply conductors get warm and lose energy to the surroundings.The magnetic effect is made use of in electromagnets, motors, transformers, etc.The chemical effect is made use of in electrolysis (electroplating), but can also cause galvanic corrosion.Any of these effects can be used to define the unit of electric current, the ampere. Until around 1947, the chemical effect was used -based on the amount of silver deposited on an electrode in a given period of time. Since then, the magnetic effect has been used, with the ampere being defined in terms of the resulting force between parallel conductors.
Why ampere is base unit if it is derived from charge?
The ampere is the SI Base Unit or electric current. It is NOT derived from the charge (coulomb) but from the force resulting from its magnetic effect. The ampere is defined in terms of the force between two, parallel, current-carrying conductors due to the interaction of their magnetic fields. The coulomb, on the other hand, is an SI Derived Unit, based on the ampere and the second.
SI unit of magnetic-induction?
Electromagnetic induction is the process of inducing electric current in a coil with the help of a magnet.Whenever a conductor is moved through a magnetic field, or the magnetic field fluctuates in strength (as with an AC electromagnet), a current will be induced in that conductor. Induction cooktops work by passing a large AC current through a conductor under the cooktop, creating a fluctuating magnetic field which induces an electric current through the cookware - heating the cookware by electrical resistance.The process by which a substance, such as iron or steel, becomes magnetized by a magnetic field. The induced magnetism is produced by the force of the field radiating from the poles of a magnet.CommentFurther to the original answer, it is a voltage that is induced into a conductor, NOT a current.
How does an auxiliary transformer work?
Auxiliary transformer- current transformer The current transformer is working based on two theories. 1.Ampheres law. 2.Faradays law. Amp.law- whenever a current flows through the conductor it will produce magnetic flux around the conductor. based on above principle- current flows through the primary will induce a magnetic flux in the CT core. Faraday law- whenever a conductor cuts the magnetic flux or magnetic flux cuts the conductor will induce a emf across the conductor based on above principle- the magnetic flux in the core will cuts the windings. so emf is induced across the secondary terminals . whenever the secondary terminals connected with burden will make a closed path and current flows through the secondary to burden.
Is NMR a solvent extraction technique?
NMR stands for Nuclear Magnetic Resonance. It's an analytical/spectrographic technique based on the Zeeman effect.
What is magnetic bearing?
It is a bearing (a direction) based on a magnetic compass reading.
Write a short note on magnetic disk?
Magnetic tape is a medium for magnetic recording, made of a thin magnetizable coating on a long, narrow strip of plastic. It was developed in Germany, based on magnetic wire recording. Devices that record and play back audio and video using magnetic tape are tape recorders and video tape recorders. A device that stores computer data on magnetic tape is a tape drive.
What are the current trends of education?
Many schools are now allowing the use of technology devices such as iPads. They are also doing more project-based classes.
Why a changing magnetic field affects a metal but not something made of plastic?
Because the entire concept of magnetic field is based on the element IRON (and to a much lesser degree, Nickel). Iron content? (most metals): Magnetic. Plastic based? (no iron): Not magnetic. Simple as that.
How can a coil of wire pick up a nail?
When a wire has an electric current run through it it produces a magnetic feild. A coil of wire (also called a selonoid) produces a strong magnetic feild perpindicular to the turns of wire when a current is run through it. This is also known as electric magnet. Its also worthy to note that speakers work based off of this concept
What material is used in electro magnets?
The magnetic field in an electromagnet is actually produced by the coil of wires with a current running through it. However certain materials, termed 'ferromagnetic' materials concentrate the magnetic flux when a rod of the material is placed within the coil (termed the 'magnetic core'). The most common of materials used for this have been iron based.
