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Electricity and Magnetism
Electricity and magnetism are ultimately inextricably linked. Electricity is the term given to a group of physical phenomena involving electric charges, their motions, and their effects. Magnetism is the force generated by the passage of an electric current through matter.
3,116 Questions
How many ways can you think of in which electricity is used to cool objects or people?
electricity could be used to power;
a refrigerator unit to cool fluids and foods,
a cooling fan which circulates air to create a cooling - effect,
a pump system which pumps water within a cooling system to reduce the heating effect of the objects.
What is the polarity of rubber?
Rubber is non-polar because its molecular structure contains primarily carbon-carbon and carbon-hydrogen bonds. As a result, rubber does not have regions of significantly different electronegativity, which is characteristic of polar molecules.
Do all countries have a national grid?
Not all countries have a national grid system for electricity distribution. Some countries may have decentralized systems, regional grids, or isolated power systems depending on their geographical size, population density, and energy resources.
One of most basic laws of science is the Law of the Conservation of Energy. It states that energy cannot be created or destroyed; it can only be changed from one form to another.
Which type of water is best conductor electricity?
Pure water is not a good conductor (of electricity) at all, but most real water contains some ions, which greatly increase its conductivity.
Pure water is not a good conductor (of electricity) at all, but most real water contains some ions, which greatly increase its conductivity.
Pure water is not a good conductor (of electricity) at all, but most real water contains some ions, which greatly increase its conductivity.
Pure water is not a good conductor (of electricity) at all, but most real water contains some ions, which greatly increase its conductivity.
Can a electric current affect a compass?
Yes. An electric current is surrounded by a magnetic field, and this will affect a compass. Please note that this is more noticeable in the case of DC - for AC, the current changes all the time, it changes very quickly, and the AVERAGE value of the magnetic field is zero.
If you move to another state what will happen to the deposit you paid for electricity?
When you move to another state, your electricity deposit may be returned to you by your current utility company, typically after your final bill is settled. Make sure to provide your forwarding address to ensure you receive the deposit refund. Alternatively, the deposit may be transferred to your new utility provider if they require one.
Why is electricity important in your country?
Electricity is significant because electricity represents everything we experience. Light is electricity, meaning everything you've ever seen is thanks to electricity. also it is the electric repulsion atoms have that gives the world the solidity we perceive it to have, so even a mechanical engine relies on electrical properties to operate. also nearly all branches of science boil down to electricity. chemical reactions are really mostly electrical reactions. and biology is basically another application of chemistry.
Which is the cheapest electricity?
Hydroelectric power is the cheapest renewable energy source for large-scale production. That is, it has the lowest cost to construct and maintain the generating facilities compared to the amount of energy produced.
Solar power is the cheapest renewable energy source for small-scale use, such as pocket calculators, LED lights, and remote (small) electrical appliances.
How can we increase the magnitude of the magnetic field of an electric magnet?
You can increase the magnitude of the magnetic field of an electromagnet by increasing the number of turns in the coil, increasing the current flowing through the coil, and using a ferromagnetic core material within the coil. These factors collectively enhance the strength of the magnetic field generated by the electromagnet.
How can a positive balloon stick to a neutral wall?
All matter contains positive protons and negative electrons. When you bring a positively charged balloon close to a neutral wall, the wall becomes polarized. The electrons in atoms move colser to the balloon, making the near side of the wall seem negatively charged and farther components seem positive charged. This has a net attractive force on the balloon.
What is something shiny and conducts electricity well?
A metal such as silver or copper fits this description. These metals have high electrical conductivity and also exhibit a shiny appearance when polished.
How does electricity affects our lives?
In the northern hemisphere, it gets dark outside as early as 5-6pm during the fall-winter. In olden days, people got up at dawn and went to bed shortly after it became dark in the evening-- between 7-8pm most people went to sleep. Today, however, we have many activities during daylight hours and so must continue our work during the evening. Below is a beginning list of the ways our lives would not be the same if we had no electricity:
- We'd still be using candles, which would require us to make candles at home.
- We might use gas lights (after 1880s), but risk fires and deaths.
- We'd still be beating carpets and rugs with a wire racket outside.
- We'd have to rely on manually bringing water into our homes---no treatment plants and no pumps.
- There'd be more risk of contaminated water--no treatment plants.
- Speaking of treatment plants, without those, we'd still use out-houses for toilets.
- All household chores would need to be done during daylight hours.
- We wouldn't enjoy physical safety going out because without lights we could trip, fall, etc.
- Studies and schooling would be much harder.
- More people's eyesight would suffer from reading in low light.
- We wouldn't have manufacturing or jobs.
- Mining would be set back 100 years, with using mules and donkeys.
- Oil production would suffer.
- Home heating would rely on coal, possibly gas, if we figured out how to get it from underground. If you never lived with a coal fired furnace, let me say, it is a lot of work every 2 to 4 hours just to keep warm.
- We wouldn't have electric rail, mass transit. We'd be set back to before the electric streetcar.
- No television.
- No computers or computer devices.
- No iPads.
- No stereos, Boom Boxes, other electrical devices that play music.
- No telephones.
- No DvDs, CDs, on Demand TV, or recording TV programs.
- Without electricity, manufacturing would not have developed. So, no batteries, generators, etc.
- Heat! We'd swelter in summers with no fans, no AC.
- Because there'd be no pumps to bring water to homes, we'd have to tote water to bathtubs--- lots of people would be stinky because bathing would be too much of a chore.
- Of course, without manufacturing, we wouldn't have the assortment of clothing, coats, and shoes!
- We wouldn't have washers and dryers--- lots of hand washed laundry and hanging it out to dry in the sun.
- Of course, we'd be dependent on weather! Clothes can't dry outside in a snowstorm!
- Without electricity, many machines would never have been invented. As one example, we'd be back to using a pedal sewing machine or hand sewing, or using a pedal powered organ or pitch pipe for singing.
- Look around your town, and mentally make an X over anything that requires electric.
- Look around your home and outside. Write down all the things that use electric to operate.
Why are transformers used for transmission of electricity into your home?
The voltage provided by power company are higher what your home uses so transformers step down the voltage for your house. Higher voltages in your home would cause a potential safety hazard. The higher voltages on transmission lines are used to cope with voltage drops over long distances.
ELV stands for "Extra Low Voltage" and refers to electrical systems that operate at a lower voltage than standard power distribution systems. ELV systems are typically used for telecommunications, data networks, security systems, and lighting control, among other applications. These systems are designed to enhance safety, reduce energy consumption, and provide more precise control over connected devices.
Is glass a strong electrolyte?
No, glass is not a strong electrolyte. Strong electrolytes dissociate into ions completely in solution, leading to high electrical conductivity. Glass, on the other hand, is a non-conductive material and does not readily dissociate into ions in solution.
IS A WOODEN STICK AN INSULATOR OR CONDUCTOR?
A wooden stick is considered an insulator because wood is a poor conductor of electricity. It does not allow electricity to flow easily through it like a conductor would.
Is coin a conductor or insulator?
Yes, a coin is a conductor because it is made out of metal, as well as keys, sewing needles, and iron nails are all conductors.
Can gamma rays from stars be captured and turned to energy?
Yes, but not to any usable amount. The amount of energy that comes from gamma rays bursts are, by the time they reach here, quite small. The INTENSITY of the bursts may be large, but they don't last very long. Also, they come from outside our galaxy, so they have lost most of their energy by the time they get to us. And the direction they arrive from is impossible to predict, so any collector would be impossible to aim for maximum efficiency.
If a ten meter by ten meter collector was 100% efficient in converting gamma ray energy into electricity, and was able to collect enough energy from gamma rays to power a 100 watt light bulb for ten minutes; the amount of gamma ray energy hitting our Earth would kill all humanity in less than a week. In a sense, it is a blessing that there is not a lot of gamma ray energy reaching us!
Why not all magnets have a magnetic field?
Not all materials can be magnetized permanently because they don't have unpaired electrons in their atomic structure. Only materials with unpaired electrons can align their spins to create a magnetic field and exhibit magnetic properties. Materials like iron, nickel, and cobalt have this property and can be magnetized.
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Do two negatives attract or repel each other?
Two charges that are the same ... either both negative or both positive ... repel each other.
Two charges that are different ... one negative and one positive ... attract each other.
Why does electricity flow through metal easily?
Because the molecules in metal are slower when cold and therefore let electricity run through it easier.
Can K3PO4 conduct electricity?
Not unless it is either:
- dissolved in water
- melted
You need to have mobile ions for a salt to conduct.
Why are heating elements of toasters made of alloy instead of iron?
1). You want the resistance of the heating element to be somewhat more than the
resistance of a pure iron one.
2). When the heating element heats up to glowing, you don't want it to melt and
fall to the bottom of the toaster in a blob. So you need a substance with a melting
temperature higher than that of pure iron.
