Description : Could the radiation on Mars be used to generate electricity?
Last Answer : I defer to Rocketguy who is a literal rocket scientist. But I don’t think so. Certainly it wouldn’t be a regular source of energy. Even solar isn’t a regular source of energy.
Description : Is there a positive charge EMP? Can electricity be contained?
Last Answer : EMP stands for electro-magnetic pulse. Under those conditions the circuits are exposed to both electrical and magnetic fields. When a circuit and housing are designed you build them to satisfy ... so the device will still be working when only cockroaches and tardigrades are walking the earth.
Description : Does a source of electricity ever run out of electrons? -Physics
Last Answer : We can roughly classify all electrical systems into two categories: static electricity systems and circuit electricity systems. Note that all electrical effects are actually part of one unified set of physical laws. ... go away. They are still there as a natural part of the materials in the circuit.
Description : Can electronic devices charge themselves without being plugged into an electricity source? -Physics
Last Answer : Yes, electronic devices can charge their batteries through various methods without being plugged into a source of electricity. What all the different methods have in common is that they absorb energy that is ... several commercial products, such as Google's Nexus 4 phone and Nokia's Lumia 920 phone.
Description : What energy does an electric cell use to generate electricity ?
Last Answer : Electric cells generate electricity using chemical energy.
Description : Which one needs electricity to run ?
Last Answer : Electric power is required to operate an electrical device.
Description : What is the basic unit of electricity ?
Last Answer : The basic unit of power.
Description : What is the basic amount of electricity ?
Last Answer : Basic amount of electric current.
Description : What is the reaction of a fuel cell to generate electricity ?
Last Answer : Answer : Electricity is generated from fuel by the redox reaction that takes place between the two electrodes of the fuel cell.
Description : What is electricity ?
Last Answer : The force felt by a single positive charge at a point in an electric field is called the electric force of that point.
Description : Who was the first to show the process of making a magnet with electricity ?
Last Answer : In 1820 , Arstad first showed the subject.
Description : What is static electricity ?
Last Answer : The electricity which is generated by friction and remains at the place of origin is called static electricity.
Description : What kind of electricity is generated by rubbing a balloon with a sweater ?
Last Answer : The electricity generated by rubbing a balloon with a sweater is static electricity.
Description : Which is a good conductor of electricity?
Last Answer : – Human body
Description : What is the best conductor of electricity?
Last Answer : – Salt water
Description : Which of the following is false? (1) Most carbon compounds are poor conductors of electricity. (2) The force of attraction between carbon molecules is not very strong. (3) The atomic number of carbon is 6. (4) The earth’s crust has about 2% carbon in the form of minerals.
Last Answer : (4) The earth’s crust has about 2% carbon in the form of minerals.
Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures
Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.
Description : Why are covalent compounds poor conductors of electricity? (1) Due to the presence of charged particles. (2) Due to the absence of charged particles. (3) Due to the presence of a triple bond. (4) None of the above
Last Answer : (2) Due to the absence of charged particles. Explanation: In a covalent compound, electrons are shared between atoms. This leaves no free electrons and hence there and no charged particles. This leads to covalent compounds being poor conductors of electricity.
Description : Copper wires are generally used for electrical power transmission instead of iron wire because (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : (3) copper is a better conductor of electricity than iron Explanation: Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
Description : Super conductors are substances that – (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current
Last Answer : (1) offer minimum resistance to flow of electric current Explanation: A superconductor is a material that can conduct electricity or transport electrons from one atom to another with no ... is released from the material when it reaches the temperature at which it becomes superconductive.
Description : What does the symbol R in electricity stand for? (1) Refraction (2) Resonance (3) Rarefaction (4) Resistance
Last Answer : (4) Resistance Explanation: In electricity, R stands for resistance, the property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.
Description : Which of the following is a good conductor of heat but bad conductor of electricity? (1) mica (2) asbestos (3) celluloid (4) paraffin wax
Last Answer : (1) mica Explanation: Mica is a good conductor of heat but bad conductor of electricity.
Description : The best conductor of electricity among the following is - (1) copper (2) iron (3) aluminum (4) silver
Last Answer : (4) silver Explanation: Copper and Silver Are Most Common. Silver is the best conductor of electricity because it contains a higher number of movable atoms (free electrons).
Description : Photon is the fundamental unit/ quantum of – (1) gravitation (2) electricity (3) magnetism (4) light
Last Answer : (4) light Explanation: A photon is an elementary particle, the quantum of light and all other forms of electromagnetic radiation. The modern photon concept was developed gradually by Albert Einstein.
Description : The device used to convert solar energy into electricity is – (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell
Last Answer : (1) Photovoltaic cell Explanation: Sunlight is converted into electricity using photovoltaics (PV). A photovoltaic system employs solar panels composed of a number of solar cells to supply usable solar power.
Description : Solids which conduct electricity at higher temperature but not at lower temperature are called (1) super-conductor (2) metallic-conductor (3) semi-conductor (4) insulator
Last Answer : (3) semi-conductor Explanation: Semiconductors are insulators at low temperatures and reasonably good conductors at higher temperatures. As temperature increases, the semiconductor material becomes a better and better conductor.
Description : Which of the following is a conductor of electricity? (1) Rubber (2) Pure water (3) Salt water (4) Benzene
Last Answer : (3) Salt water Explanation: Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it ... charged Chlorine CF. When current is applied, it is easily conducted by the highly charged ions.
Description : Metals are good conductors of electricity because - (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Last Answer : (1) they contain free electrons Explanation: Copper is used for electrical wiring because it is a good conductor of electricity. Metal particles are held together by strong metallic bonds, which is why they have high melting and boiling points.
Description : Which one of the following non-metals is not a poor conductor of electricity? (1) Sulphur (2) Selenium (3) Bromine (4) Phosphorus
Last Answer : (2) Selenium Explanation: Selenium is a non-metallic element; it is not a very good conductor of heat and electricity.
Description : The best conductor of electricity among the following is : (1) Copper (2) Iron (3) Aluminium (4) Silver
Last Answer : (4) Silver Explanation: Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
Description : Which of the following is the best conductor of electricity? (1) Ordinary water (2) Sea water (3) Boiled water (4) Distilled water
Last Answer : (2) Sea water Explanation: Sea water is a "good" conductor. It has a resistance and resistance increases by distance. So if you dip a very high voltage electric wire in the ocean, the area around it (even 100 meters or more based on how high it is) gets electric.
Description : Which of the following is the best conductor of Electricity? (1) Ordinary water (2) Sea water (3) Boiled water (4) Distilled water
Last Answer : (2) Sea water Explanation: It sounds crazy, but it's true! This is because Sea water has Salt that is a good conductor of electricity. Salt molecules are made of sodium ions and chlorine ions.
Description : Electricity is transmitted over long distances – (1) it is fast (2) there is less wastage of energy (3) it is safer (4) it is cheaper
Last Answer : (2) there is less wastage of energy Explanation: Long distance means higher wastage of energy. So High volt direct-current (HVDC) technology is used forgreater efficiency in very long distances. ... at high voltages (110 kV or above) to reduce the energy lost in long-distance transmission.
Description : Which of the following is the best conductor of electricity? (1) Zinc (2) Copper (3) Gold (4) Silver
Last Answer : (4) Silver Explanation: Copper and Silver Are Most Common. Silver is the best conductor of electricity because it contains a higher number of movable atoms (free electrons).
Description : Metals are good conductors of electricity because – (1) they contain free electrons (2) the atoms are lightly packed (3) they have high melting point (4) All of the above
Description : Which of the following are bad conductors of electricity? (1) Mica and Quartz (2) Metals and Rubber (3) Metals and Mica (4) Mica and Rubber
Last Answer : (1) Mica and Quartz Explanation: Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
Description : Which of the following is a good conductor of heat but a bad conductor of electricity? (1) Celluloid (2) Rubber (3) Asbestos (4) Mica
Last Answer : (4) Mica Explanation: Good conductors of heat are good conductors of electricity. Mica is an exception which although being a good conductor of heat and a bad conductor of electricity. It is commonly ... to assist in the transfer of the generated heat to the heat sink or chassis for dissipation.
Description : Nuclear reactors used to produce electricity are based on – (1) Nuclear fission (2) Nuclear fusion (3) Cold fusion (4) Superconductivity
Last Answer : (1) Nuclear fission Explanation: A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion ... (water or gas), which runs through turbines that power either ship's propellers or generators.
Description : Pure water is bad conductor of electricity because it is – (1) feebly ionized (2) not volatile (3) a very good solvent (4) a non-polar solvent
Last Answer : (1) feebly ionized Explanation: Pure water is a covalent compound. It exists as simple discrete molecules and have a simple molecular structure. Hence, it does not exist as ions. Therefore, ... into hydrogen ions and hydroxide ions. The presence of mobile ions enables it to conduct electricity.
Description : Good conductor of electricity is – (1) dry air (2) paper (3) kerosene (4) graphite
Last Answer : (4) graphite Explanation: Graphite has a tendency to behave very much like a metal because the carbon molecules arrange themselves into a lattice structure. The crystal lattice is the same orientation that ... better than the dry air paper and kerosene and that's what makes it a good conductor.
Description : In a nuclear power reactor, fission produces heat which is used to produce electricity. A reactor producing more fissionable material than it consumes is known as what kind of reactor?
Last Answer : ANSWER: BREEDER REACTOR
Description : Photoelectric electricity is produced directly from solar energy when which of the following are absorbed in a semiconductor to create an electric current? w) protons x) electrons y) neutrons z) photons
Last Answer : ANSWER: Z -- PHOTONS
Description : A 100-watt light bulb is left on for 10 hours. Electricity is 10 cents per kilowatt-hour. How much did it cost to operate the light bulb?
Last Answer : ANSWER: 10 CENTS
Description : For which of the following reasons is plutonium-238 used for generating electricity on spacecraft? w) It is an alpha emitter with long half-life. x) It is a beta emitter with high specific power. y) It occurs abundantly in nature. z) It has low specific power.
Last Answer : ANSWER: W -- IT IS AN ALPHA EMITTER WITH LONG HALF-LIFE.
Description : Gauss' law of electricity, Gauss' law of magnetism, Faraday's law of induction, and Amperes' law form the basic equations of electromagnetism. This combination is collectively known as: w) Coulomb's equations x) Volta's equations y) Fermi's equations z) Maxwell's equations
Last Answer : ANSWER: Z -- MAXWELL'S EQUATIONS
Description : Copper wires are generally used for electrical power transmission instead of iron wire because : (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : copper is a better conductor of electricity than iron
Description : The device used to convert solar energy into electricity is (1) Photovoltaic cell (2) Daniell cell (3) Electrochemical cell (4) Galvanic cell
Last Answer : Photovoltaic cell
Description : Super conductors are substances that (1) offer minimum resistance to flow of electric current (2) conduct electricity at low temperature (3) conduct electricity at high temperature (4) offer high resistance to the flow of electric current
Last Answer : offer minimum resistance to flow of electric current
Description : Photon is the fundamental unit/ quantum of (1) gravitation (2) electricity (3) magnetism (4) light
Last Answer : light
Last Answer : semi-conductor