Resistance of a wire Resistance Resistance can be defined as a force which opposes the flow of an electric current (electrons) around circuit. So energy is required to push the electrons around the circuit. The circuit can also resist the flow of electrons if the length of the wire used is long or the cross sectional area is large. The unit of resistance is measured in VA-1 or Ohms (Ω) and the formulae of resistance can be represented as this: RESISTANCE= VOLTAGE CURRENT Strategy What I am tying to find out is whether the thickness of a wire will affect the resistance of the wire. What I am going to measure in this experiment is the thickness of the wire and the resistance it gives.
Prediction I predict that the resistance of the wire will increase as the wire length also increases. Scientific theories that explain my prediction The first theory I’m basing my prediction on is Collision Theory, where free electrons collide with oppositely charged atoms. Therefore, the longer the wire, more collisions should occur, meaning resistance will increase; because more collisions mean the slower they will move. Ohm’s Law is the second theory I’m basing my prediction on. Ohm’s law is used to calculate resistance in the following equation.
These same principles of Conduction apply also to flow of Electricity as in the flow of Electrons. The electrons in piece of metal can leave their atoms and move about in the metal as free electrons. The parts of the metal atoms left behind are now charged metal ions. The ions are packed closely together and they vibrate continually. The hotter the metal, the more kinetic energy these vibrations have.
The resistance of a wire I will be conducting an experiment to explore the resistance of a wire. My prediction for this experiment is that the resistance will increase when the length is also increased. Electricity is the flow of electrical power or charge, it is both a basic part of nature and one of our most widely used forms of energy. What flows through the wire is known as an electron. Electrons are tiny particles that move around randomly, this is also known the flow of electrons, which is an electric current.
It is an effect where the voltage or electric current is created in the material due to exposure to light. It is different from the photoconductive mode. When some light source is shine or enter on the surface of the photodiode, the electron in valence band absorb the light energy or heat energy and turn into excited state, then jump to the conduction band and become free electron. These free electrons will then diffuse or accelerated to other materials and this generates electromotive force or current. This is how light energy is converted to heat energy.
Atoms near the surface of a material that have lost one or more electrons will have a positive electrical charge. Cause of Static Electricity Static electricity is usually caused when certain materials are rubbed against each other, it's also caused when materials are pressed against each other and pulled apart. This process causes electrons to be pulled from the surface of one material and relocated on the surface of the other material. The material that loses electrons ends up with an excess of positive charges causing it to be positively charged, and the material that gains electrons ends up with an excess of negative charges on its surface causing it to be negatively charged. Examples of static electricity: Effects of Static Electricity Attraction - When rubbing a balloon on your hair, the balloon collects negative electrical charges on its surface and the hair collects positive charges.
Magnetoelastic sensors EXPLAINATION OF MAGNETOELASTIC SENSORS Magnetoelastic-Describing the interaction between magnetization and strain in a magnetic material. Magnetoelastic sensors are, generally, ribbon-like thick-film strips made from amorphous ferromagnetic alloys, such as Fe40Ni38Mo4B18 (Metglas 2826MB). The elastic waves within the magnetostrictive magnetoelastic material generate a magnetic flux that can be detected remotely. Magnetoelastic sensors with a size of approximately 4 cm × 6 mm × 25 μm are widely used as anti-theft markers. Exposure to a time-varying magnetic field produces longitudinal vibrations in these sensors that, in turn, generate elastic waves.
In a heterojunction, due to the difference in bandgap of the materials, a potential barrier forms that creates obstacle for the electrons/holes to travel from one side to the other. Such trapping of holes reduces the efficiency of the solar cell. However, a fraction these electrons/holes pass the potential barrier through Quantum Tunneling and create a tunneling current, which contributes to the overall current; hence improving the efficiency. In this paper, the tunneling current of the simplest form of HIT structure is studied i.e. P-type a-Si/i-Si/N-type c-Si.
When the saturation is reached, the core reluctance greatly increases causing the flux to increase much slower with the increase of the mmf. Open circuit test characteristic graph Short Circuit Test The short-circuit test provides information about the current capabilities of a synchronous generator. It is performed by 1) Generator is rotated at rated speed. 2) Adjust field current to 0. 3) Short circuit the terminals.