An increment of 3cm for every x coordinate (x=0, 3, 6, 9, 12, and 15) and voltage readings of .25, .30, .50, .75, and 1.00 will be measured. Below are two tables (because two different metal plates are used) of data that illustrate the voltage readings collected during the experiment. The readings on the voltmeter measure the electric potential of two different charge distributions and this measurement can be used to find the electric field. Electric field lines starts on a positive charge and end on a negative charge. The number of electric field lines tells us the amount of
A solenoid is just a coil of wire, but when you run a current through it, you create an electromagnet. Electromagnets are particularly useful because, unlike regular magnets, they can be switched on and off, and strengthened by increasing the current flowing through them. When you run a current through a solenoid, you get a supper strong magnet because the magnetic field is concentrated inside the coil. Electromagnetic solenoids find uses all over the world. They’re in hotel door locks, water-pressure valves, MRI machines, hard disk drives, speakers, cars, and
The bigger the values of the resistors, the bigger the values of the electromotive force will be resulted. This shows that the voltage range and resistor value is linear to each other, while perpendicular with the value of the current. For more clear details, see the date table above Conclusion Overall, both parts of this lab demonstrated the relationship outlined by Ohm’s Law and fostered a higher comprehension of the mechanisms driving circuit behavior. The direct relationships between voltage, current, and resistance allow measurement of the voltage and current without resistance being known. Moreover, the experiment also demonstrated how the different configurations of resistors, parallel or in a series could play a role in the behavior of the circuit and its components.
1831- Using his invention the induction ring, Michael Faraday proved that electricity can be induced (made) by changes in an electromagnetic field. Faraday’s experiments about how electric current works, led to the understanding of electrical transformers and motors. This experiment became Faraday’s Law, which became one of the Maxwell Equations (Administrator, 2007). 1890 - Heinrich Hertz (1857-1894) a German physicist, laid the ground work for the vacuum tube. He laid the foundation for the future development of radio, telephone, telegraph, and even television.
Testing the Strength of the Electromagnet by Changing the Number of Coils Aim The aim of this experiment is to investigate how the strength of an electromagnet is affected by the number of coil turns around the iron c-core. Hypothesis As the number of wire coils increases, the strength of the magnetic field (the electromagnet’s strength) will also increase. This means that the number of paper clips that attach to the electromagnet will increase. Explanation of Hypothesis/background: When a DC (Direct Current) electric current flows through a wire, a magnetic field is created. Wrapping the wire in a coil concentrates and increases the magnetic field, because the additive effect of each turn of the wire.
The purpose of this experiment was to use charged electrodes on conducting paper and voltmeter to discover electric field. The experiment also discovered the relationship between equipotential lines and electric field lines. The purpose of the experiment was to find if the theory that equipotential lines always run perpendicular to electric field lines hold true. The equation used in this experiment is E = ∆V/∆d. The experimental value yielded a result of y = -100x + 10 and the theoretical yielded a -100 V/m.
Introduction The goal of this experiment was to acquire an understanding of the fundamentals of measurement in addition to analyzing the gathered data. During the experiment, an understanding of basic experimental error was gained as well as how to utilize the error equations to account for margins of error in each experiment. For Investigation 1, the mass, length and diameter of four separate cylinders was measured and utilized to calculate the volume and density of the cylinders. After recording these results in the table, the data of the cylinders was graphed. Then, in Investigation 2, a Geiger counter was utilized to measure background radiation in the lab at intervals of one minute for sixty minutes.
Engineers came up with idea of using different types of fluids that can change its property according to the external forces. For example MR (Magneto-Rheological) fluids and ER (Electro-Rheological) fluids. MR fluids are materials that expose a change in rheological properties such as elasticity, viscosity or plasticity with the application of a magnetic field. On the other hand, ER fluids alters its rheological property when an electric field is applied to the fluid. MR fluids require small voltages and current, while ER fluids require very large voltage and very small currents.
This is given in Equation 15. (dC_A)/dV=r_A/Q (15) Conductivity In the experiment the concentration of the mixture is measured by the means of a conductivity probe. The conductivity referred to in this case is electrical conductivity. This is the ability of ionised compounds to transfer electrical current in an aqueous solution. It is measured in units of mS/cm.
He also noticed that as the coil loops increased so did the voltage as read on a galvanometer. This process of moving the magnet in between the coil wire demonstrated electromagnetic induction. The experiment performed by Erin Bjornsson they talk about how to perform “Faraday’s Experiment” (Bjornsson, 2013) By following similar steps performed by Michael Faraday their hypothesis asked “what will happen when you pass a strong magnet through a loop of copper wire.” (Bjornsson, 2013) With a similar setup as Faraday they passed a magnet through a cardboard tube that had wire wrapped around it. As more loops were added more current was shown on a galvanometer. They tested Faraday’s process and proved it to be correct.
VII. CONCLUSION This paper proposes a dual three-level T-NPC inverter fed dual PMSM topology for low-voltage, high-power applications. Both simulation and experimental results show a significant improvement over the conventional single T-NPC inverter fed PMSM drive. The proposed topology and its interleaved PWM control strategy are capable of maintaining balanced DC-link capacitor voltages both during steady-state and transient conditions. Moreover, due to the control strategy, the current stress of the DC-link capacitors is also reduced by
4.11 Motor A DC motor is an electrical machine which converts electrical energy into mechanical energy. A magnetic field is generated by the current carrying conductor and when this system is placed in external magnetic field then the force is exerted which is proportional to the strength of the external magnetic field and to the current in the conductor, then motor will rotate. If the direction of current is reversed then the direction of rotation of motor will also reverse. The speed of DC motor can be controlled by the variable supply voltage or by changing the strength of current. Small DC motors are used in toys, tools, and appliances.
“Theodor Geisel, a.k.a. Dr. Seuss, influenced nearly every living American who ever learned to read(Porter William. ).” Theodor’s books have introduced millions of children into the joy of reading. The books teach morals and responsibility. When children read books they learn and take in what the books are trying to tell them.