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In order to read a tape measure, place the zero carefully and line up both ends before taking down a reading. Find out how to read the units on a tape measure, whether they are in inches or centimeters, with help from a science teacher in this free video on measurements and tools.
An electromagnet, as opposed to a permanent magnet, can be switched off and designed to provide greater strength. Find out how to wrap a coil wire to make an electromagnet with help from a science teacher in this free video on electromagnets and physics.
When using electromagnets, pay attention to the fact that there is both a positive and a negative side, with electrons going from minus to plus. Determine the north and south poles of an electromagnet with help from a science teacher in this free video on electromagnets and physics.
Making a stronger electromagnet can be as simple as increasing the current through the coil wire by increasing the voltage provided to the wire. Double a current to increase electromagnetism by four with help from a science teacher in this free video on electromagnets and physics.
When making electromagnets with a nail and wire, an iron or steel nail must be paired up with a copper or aluminum wire. Avoid using a battery with too much voltage when making a homemade electromagnet with help from a science teacher in this free video on electromagnets and physics.
The strength of an electromagnet is directly related to the number of turns in the wire coil that is used to make the magnet. Discover how to increase the current to increase the strength of electromagnets with help from a science teacher in this free video on electromagnets and physics.
When discussing electricity and safety, many people neglect to mention the fact that most house fires are caused by electrical problems. Avoid handling electrical appliance with wet hands, and switch off electrical supplies when changing appliances with help from a science teacher in this free video on electricity safety.
When using a battery to turn on the light bulb, it's highly important that the battery and the light bulb match in terms of power requirements. Find out how to use eight 1.5 volt batteries to power a 12 volt light bulb with help from a science teacher in this free video on electricity and physics.
Digital transfer of information along optical fibers is much more efficient than when electrical wires are used. Discover how fiber optics are used to transmit light, and turn it into electrical signals with help from a science teacher in this free video on fiber optics.
Domains are large areas in ferromagnets in which the magnetism of the individual atoms and molecules are all aligned in the same direction. Discover how ferromagnetic material becomes magnetic with help from a science teacher in this free video on magnetism and physics.
When discussing the negative effects of technology, people often bring up the fact that communication commonly occurs between individuals and machines, and not other people. Learn about the pollution caused by technology with help from a science teacher in this free video on technology.
Windmills rotate when powered by wind, and this rotation is used to drive machines, such as grindstones or pumps. Discover how sails are used to gear up a windmill's rotation with help from a science teacher in this free video on windmills and physics.
Electromagnets and electromagnetism can be used for loud speakers, microphones, metal sorting and electric motors. Find out how to use electromagnets to produce relays with help from a science teacher in this free video on electromagnets and physics.
In order to repel two pieces of metal, two magnets are needed because electromagnets will only repel each other. Discover why electromagnets can't repel two pieces of metal with help from a science teacher in this free video on electromagnets and physics.
In order to change the rotation of an electric motor, change the direction of the motor by changing the direction of the current, or magnets. Make an electric motor rotate faster by increasing the strength of the magnets with help from a science teacher in this free video on electric motors and electromagnets.
Steel is usually made up of 96 percent to 98 percent iron, and the rest is mainly carbon, but these elements need to possess certain properties to make steel. Discover how to add chromium or manganese when making steel with help from a science teacher in this free video on steel production.
The advantages of solar energy are that it's free once it is harnessed, it is infinite because of the sun, and it is a renewable source of energy. Discover why solar energy is not necessarily clean energy with help from a science teacher in this free video on solar energy.
The positive effects of nuclear energy are that it is used for a great deal of the energy of many countries, and it is reasonably cost effective. Learn about the pollution caused by nuclear energy with help from a science teacher in this free video on nuclear energy.
The surface of Neptune isn't very solid, being a gas giant, and the surface temperature is -225 degrees Celsius. Learn about the atmosphere of Neptune, which is made of hydrogen, helium and methane, with help from a science teacher in this free video on planetary science.
Two basic types of telescopes include reflecting and refracting telescopes. Discover how reflecting telescopes use mirrors as the objective, while refracting telescopes use an objective lens with help from a science teacher in this free video on telescopes.
Optical fibers are made of solid, transparent glass, and they are used to transmit light pulses in things like televisions and telephones. Discover how optical fibers are used in the medical field with help from a science teacher in this free video on fiber optics.
Microscopes are used for looking at objects that are very close to us, yet are very small in size. Find out how slides are used to look at objects with microscopes in biology with help from a science teacher in this free video on microscopes.
A barometer is a device that measure atmospheric pressure, and a barometer can be made with mercury, or it can be an aneroid barometer. Discover how to make an aneroid barometer at home with a plastic bottle with help from a science teacher in this free video on barometers and atmospheric pressure.
A temporary magnet is usually something like an electromagnet, which can have its magnetism turned on and off. Discover how to make an electromagnet with a coil of wire and a battery with help from a science teacher in this free video on temporary magnets.
One simple experiment that uses batteries and magnets involves making a magnet by wrapping wire around a nail and attaching it to a battery. Learn about using caution when making homemade magnets with help from a science teacher in this free video on batteries and magnets.
Steve Jones Steve Jones is an experienced mathematics and science teacher. He also has many years experience in the field of public speaking and debate, and he is an organizer of debate competitions for high school students. He is the chairman of the Hungarian branch of the English-Speaking Union, which is an international educational charity founded in 1918 to promote international understanding and friendship through the use of the English language.dkdk
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