*** Luigi Galvani used an electrostatic machine that produced sparks on frog legs and began to investigate the muscular contractions produced by electricity. Galvani discovered that the frog leg would contract if a scalpel touched the frog’s nerves when the machine was on. More comprehensive experiments by Galvani showed that a dead frog’s leg could be made to twitch by electrical stimulation. Galvani also showed that the same twitching could be produced by touching the leg with a copper hook…
A DC circuit is a circuit in which current can only flow in one direction, constantly and with constant polarity. As opposed to alternating current, which changes its flow direction at regular intervals and can also increase or decrease in value. In this essay I will be mainly describing DC circuits wired in series, parallel, and series-parallel. In a DC series circuit the components are all wired together from end to end with the same amount of current flowing through each component. In a…
For the circuits, I noticed the resistors demonstrate Ohm’s Law and the currents/voltages demonstrate Kirchhoff’s law. I also found that the LED’s brightness changes with the amount of current that flows through it. The more current that flows through, the brighter the LED becomes. I also noticed that in most of the circuits, the measured values were different than the nominal values because there was…
Yes, the ruler, which was used to measure the length of the cord and tape, collected data that could be trusted. This is because rulers are manufactured to specifically measure the lengths of objects. Therefore, the units on the ruler are exact, which allows the person carrying out the experiment to end up with precise data. Yes, the power pack which provided volts of electricity for the electromagnet to work, provided the experimenter with trustable data, which was the volts of electricity it…
Electroconvulsive Therapy (ECT) is a technique used to treat psychiatric patients. ECT requires a current of electricity to pass through an individual through their forehead to induce seizures like those of epilepsy. Upon its first introduction into the psychiatric world patients of ECT suffered from fractures while having convulsions onset by their induced seizures. ECT patience’s also are known to suffer from memory loss, as memory loss is one of the main side effects of ECT.…
Lab 2 Summary In this lab, the purpose was to understand how to use a DMM to measure different things like resistances, current, and voltages as well as how to successfully comprehend the electrostatic relationship between various objects. In the first part of our lab we learned how to use a Digital Multimeter by using a simulator to draw diagrams of circuits. This helped give us a basic understanding that when dealing with a circuit and tools like a DMM, you have to connect wires to certain…
fields. When they truly arrange themselves, they can produce a single magnetic field over all. Some permanent magnets are used in the basis of electromechanical device. The electromagnets are magnets controlled by electricity and the electrical current makes a magnetic field. They use negative and positive poles to make the magnetic fields. Some soft magnetic metals can be strengthened or weaken by how much electret is flowing to electromagnet. The magnets they can use the flow from a…
Davy’s Journey Towards Electromagnetism During the early 1800s, scientists made observations that were tested repeatedly and then were seen as fact. Until 1820, electricity and magnetism were believed to be separate branches on the tree of science. Once others believed that idea it became cemented in to the scientific community. However, Humphry Davy was a chemist whose determination and experimentation overturned that idea. Despite obstacles, Oersted’s and Davy‘s experiments changed his peers’…
Explanation of EMG signals EMG stands for electromyography. Muscle fibres generate tiny electrical currents prior to the production of muscle force. These currents are generated by the exchange of ions across muscle fibres membranes, a part of the signalling process for the muscle fibres to contract. EMG is the signal made, it can be measured by applying conductive elements or electrodes to the skin surface, or invasively with the muscle. When using EMG, tiny devices named electrodes are used…
6/10/2015 Mrs Rummins | GRUJICIC, Marko Background: Another name for I/V characteristics is current-voltage. Current and voltage are the factors that are being investigated, there characteristics and effects in diodes of different colours. The Current or I in I/V characteristics refers to the flow of an electric charge. It is often carried out by electrons when moving through wires Materials: -green, red, blue, yellow coloured diodes -breadboard -wires - 2X multimeters, 1 as a voltmeter…