Electricity 2 - schoolphysics
... 7. If a current of 25 mA flows in a wire how many electrons pass that point per second? Charge on one electron = -1.6x10-19 C 8. Define: (a) resistance (b) resistivity 9. Draw a graph to show how the current varies with the voltage for: (a) a metal filament in a light bulb (b) a semiconductor 10. Ca ...
... 7. If a current of 25 mA flows in a wire how many electrons pass that point per second? Charge on one electron = -1.6x10-19 C 8. Define: (a) resistance (b) resistivity 9. Draw a graph to show how the current varies with the voltage for: (a) a metal filament in a light bulb (b) a semiconductor 10. Ca ...
Power ratings Power: a measure of how quickly energy is transferred.
... Provide ten appliances around the room as a ‘circus’. Ask students to find the power rating of each. Suitable examples would be hairdryer, toaster, kettle, hair straighteners, mobile phone charger, iron, desk lamp, printer, radio and fan heater. For safety ensure that none of the devices are plugged ...
... Provide ten appliances around the room as a ‘circus’. Ask students to find the power rating of each. Suitable examples would be hairdryer, toaster, kettle, hair straighteners, mobile phone charger, iron, desk lamp, printer, radio and fan heater. For safety ensure that none of the devices are plugged ...
1 - Portal UniMAP
... 9. The armature of a 120V dc motor has a resistance of 1.5 Ω and takes 4A when operating at full load. Calculate: a) The counter EMF produced by the armature. b) The power developed by the armature. c) Calculate the speed of the motor if the armature winding of the four poles dc motor has 360 conduc ...
... 9. The armature of a 120V dc motor has a resistance of 1.5 Ω and takes 4A when operating at full load. Calculate: a) The counter EMF produced by the armature. b) The power developed by the armature. c) Calculate the speed of the motor if the armature winding of the four poles dc motor has 360 conduc ...
Tutorial 2 (AC Fundamentals)
... 8. A relay coil has an inductance of 8mH and a resistance of 30Ω. An alternating voltage v = 5 sin (5000t) is applied to the coil. a) ...
... 8. A relay coil has an inductance of 8mH and a resistance of 30Ω. An alternating voltage v = 5 sin (5000t) is applied to the coil. a) ...
Transformers Electrical transformers are used to transform voltage or
... (rms) household service. If a particular ideal transformer draws 0.50 A from the house outlet, what are (a) the voltage supplied to the cell phone and (b) the current supplied to the cell phone from the transformer? (c) How much power is delivered? ...
... (rms) household service. If a particular ideal transformer draws 0.50 A from the house outlet, what are (a) the voltage supplied to the cell phone and (b) the current supplied to the cell phone from the transformer? (c) How much power is delivered? ...
Positive Input to Negative Output Conversion
... The buck-boost is usually the topology of choice for voltage inverting applications. There are plenty of components to choose from and most of them even come with integrated transistors or mosfets. They can work in hysteretic mode or they can switch at a fixed frequency. Very often when more power i ...
... The buck-boost is usually the topology of choice for voltage inverting applications. There are plenty of components to choose from and most of them even come with integrated transistors or mosfets. They can work in hysteretic mode or they can switch at a fixed frequency. Very often when more power i ...
Chua Circuit Equations
... Linearizing about the fixed points gives solutions varying as eλt with λ given by the eigenvalues of the stability matrix ...
... Linearizing about the fixed points gives solutions varying as eλt with λ given by the eigenvalues of the stability matrix ...
Electricity and Magnetism - Effingham County Schools
... from a generator. As the electromagnet is rotated in the permanent magnet the direction of the current alternates once for every revolution. Go to this website and click the button for DC then for AC to visually see the difference between the two. You can see that the DC source is a battery – curren ...
... from a generator. As the electromagnet is rotated in the permanent magnet the direction of the current alternates once for every revolution. Go to this website and click the button for DC then for AC to visually see the difference between the two. You can see that the DC source is a battery – curren ...
Electronics Engineering - Dronacharya College of Engineering
... Multimeters are designed and mass produced. The simplest and cheapest types may include features which are not likely to use. Digital meters give an output in numbers, usually on a liquid crystal display. ...
... Multimeters are designed and mass produced. The simplest and cheapest types may include features which are not likely to use. Digital meters give an output in numbers, usually on a liquid crystal display. ...
Kelvin Coaxial Probes
... electrically insulated measuring circuits. The typical 4-wire-methode is based on a constant current, flowing through the test resistance and the measurement of the resulting drop in voltage, which is directly proportional to the resistance value. According “I=constant” and because of the very high ...
... electrically insulated measuring circuits. The typical 4-wire-methode is based on a constant current, flowing through the test resistance and the measurement of the resulting drop in voltage, which is directly proportional to the resistance value. According “I=constant” and because of the very high ...
The PTO-generator - Publikationsdatenbank der TU Wien
... picture shows the 3x400V-mode. In the idle mode a nominal load is applied. The DC link voltage has a slight breakdown, more current is requested, therefore the torque on PTO is higher, thus the revolution speed of the PTO has a slight breakdown too. Depending on the dynamic of the controllers a stea ...
... picture shows the 3x400V-mode. In the idle mode a nominal load is applied. The DC link voltage has a slight breakdown, more current is requested, therefore the torque on PTO is higher, thus the revolution speed of the PTO has a slight breakdown too. Depending on the dynamic of the controllers a stea ...
Alternating current
Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.AC is the form in which electric power is delivered to businesses and residences. The usual waveform of alternating current in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information encoded (or modulated) onto the AC signal, such as sound (audio) or images (video).