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Why is there a positive and negative terminal in electical device?
Wiki User
∙ 11y ago
there are positive and negative terminal in electrical device who operate on dc power supply because they wont work if the connection is reversed.
but devices who operate on ac usually dosenot have polarity marks .
Wiki User
∙ 11y ago
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A device that uses energy of chemical reactions to separate positive and negative charges?
okay slender man will kill you if you dont know
What is the cathode in an electrochemical cell?
The electrode at which a reduction reaction occurs.PhysicsA cathode is the element of an electron tube from which electrons flow. Back in the day, current was thought to be positive, but we understand things differently now. In the "old school" version, the cathode was the element into which positive charges flowed. But that's usually not what is taught for the simple reason that it's a classical physics approach and isn't at all as useful as the idea that the cathode is the element from which electrons leave to go to the plate.In a two-element tube, the cathode has a compliment called the anode, or plate. Electrons flow from the cathode to the anode. Not the other way. There are tubes with three, four, and more elements, but they have these two basic elements.ChemistryThe cathode is the electrode of a polarized electrical device, such as a galvanic cell, out of which positive electric current flows. In a battery like the one in a vehicle, the positive terminal is the cathode. The car battery, which is a lead-acid battery, also has an electrode that is the compliment to the cathode: the anode. It's the negative terminal of the battery, and positive electric current flows into this electrode.The Wikipedia article on the cathode covers both the chemistry application of the term as well as the physics application, and a link is provided.
Is relay active or passive?
diode is a two terminal passive non linear device.
Why is it possible to measure an electric potential across the terminals of a dry cell?
Batteries are a voltage storage device that hold a voltage potential until used. By using a volt meter you can find the stored voltage by placing the leads of the meter across the battery's positive and negative terminals.
What is an anodization?
The elctrode that is oxidized in a galvanic cell
What determines which one of the terminal of a rheostat in positive when connected in a series?
Electron flow is from negative(-) to positive(+), the rheostat would have to be on the negative side for the device being controled, before the device, e.g. light bulb.AnswerIt doesn't matter. Rheostats don't have positive or negative terminals.
Is the positive terminal of an ammeter connected to the positive terminal of the energy source?
No. An ammeter is to be connected in series, between the device and the battery's positive output, Its NEGATIVE terminal (red lead) has to be connected to the POSITIVE of the battery. Its positive terminal (black lead) will then be connected to the device's positive terminal. (Connecting an ammeter in series with a power supply by itself may damage or destroy the meter.)Almost every single digital ammeter made will indicate reverse current, so the worst you might get is a displayed reading of a negative amperage if you connected it in reverse.(For an illustration, see the related link)
Why most car bodies are attached to the negative terminal of the battery?
The DC electrical system of the car requires a positive and negative electrical conductors for each electrical device. Taking the example of a single lightbulb powered by the car battery, this could require a wire leading from the positive terminal of the battery to one terminal on the lightbulb and a second (return) wire leading from the other terminal on the lightbulb back to the negative terminal on the battery. Two wires are required - a positive and negative. To reduce the quantity of wires required, the negative "wire" is actually the car body. Hence there is a positive wire leading from the positive terminal of the battery to the positive terminal of each electrical device on the car and the negative terminal of each electrical device on the car is connected to the car body (a metal conductor). The body of the car is then connected to the negative terminal of the battery, completing the circuit. There are virtually no return wires. This works as cars use a low voltage (12 V). If they used a higher voltage, this system could result in electric shock from touching the car body.
Is a zinc anode acts the terminal?
No. It seems Zinc would always act as the negative terminal. Anode and Cathode are the terms used when we connect an external electrical source to the device. If positive terminal of an external battery is connected to the electrode then that electrode is named as ANODE. If negative terminal is connected then it is named as CATHODE. In case of chargable device, while discharging say P acts as negative terminal. Then while charging this negative terminal would be the anode. So if the device is a chargable one and Zn acts as negative terminal while delivering current to the external load, then the same zn would acts as anode while charging.
What is meaning of series and parallel connection?
If you connect a device like a LED or a speaker in series, that means that you connect the positive terminal of one speaker/LED to the negative terminal of the other speaker/LED and apply the audio/voltage to the remaining positive and negative terminals. When you connect devices this way, that means that both of the speakers/LEDs are getting the exact same current, but different voltages depending on the position in the parallel circuit. If you connect a device in parallel, then that means that the device's positive and negative terminals are connected to the other device's positive and negative terminals, and then voltage is applied to the positive and negative terminals of the devices respectively. This means that the devices are getting the same voltage but the current varies and is highest at the positive connection and lowest at the negative connection. (The voltage that each device is getting is determined quite easily by doing the sum 'input voltage / number of devices'.)
What is negative ground battery systems?
Most vehicles are "negative ground" which means that the negative battery pole (marked with a minus sign "-") of an automobile, boat, truck, RV, or other fossil fuel powered vehicle is connected to the metal frame, engine, or chassis, of the vehicle. Whereas the positive battery terminal (marked with a plus sign "+") is connected strictly to insulated wires that are protected from completing an electrical circuit between the positive and negative posts of the battery. Since the frame and other metal parts connected to the engine, frame, or chassis are grounded to the negative terminal on the batter you can often power an electrical device by simply having one wire to the device from any positive battery terminal source and then connecting the negative pole of the electrical device to the frame, engine, chassis, or other grounded piece of metal.
Is terminal an input and output device?
Yes and no. It's...hard to explain. The monitor on the terminal is the Output device and the keyboard on the terminal is the input device.
What is batterty?
A battery is a device that stores electric charge by chemical means. Every battery has a anode and a cathode, which corresponds to the positive and negative terminals. The current always flows from the positive (anode) to the negative (cathode) terminal. Because it's a chemical process, batteries always discharge and charge much slower than capacitors, but on the upside always have much more capacity than capacitors.
What does the neg battery terminal do?
A battery has two ends -- a positive terminal (cathode) and a negative terminal (anode). If you connect the two terminals with wire, a circuit is formed. Electrons will flow through the wire and a current of electricity is produced. Inside the battery, a reaction between chemicals take place. But the reaction takes place only if there is a flow of electrons. Batteries can be stored for a long time and still work because the chemical process doesn't start until the electrons flow from the negative to the positive terminals through a circuit. we take some pairs of the Cohomer Battery Terminals to test and check the result, and you can also browse the Chomer dot com website, to choose the right battery terminals to test for yourself.Electrons are negatively charged, so they will be attracted to the positive end of a battery and repelled by the negative end. When the battery is hooked up to a device that lets the electrons flow through it, they flow from negative (anode) to positive (cathode) terminal.The whole point of a battery is to maintain a voltage (electric potential) difference between two points (i.e. the positive and negative terminals of the battery). Voltage is a strictly relative quantity. The only thing that matters in the real world is voltage differences. Usually we will pick some point to define as 0 Volts (also known as ground) so that we can pretend absolute voltages exist: if some point is 10 Volts above ground, we just say it is at 10 Volts.If you have a 9 Volt battery, for instance, there is no specified reference voltage (ground). The 9 Volts refers to the voltage difference between the “positive terminal” and the “negative terminal.” If we define the potential of the negative terminal to be ground (or connect the negative terminal at a point in a circuit we have already specified as ground), we could simply call the positive terminal the 9 Volt terminal. We could easily define our reference voltage such that the “negative” terminal is really the “more negative” terminal, and the “positive” terminal is really the “less negative” terminal, but this wouldn’t be particularly helpful.A battery allows us to maintain some constant voltage between it’s terminals. Since (conventional) current flows from higher voltage to lower voltage in a circuit, if we connect a circuit across the terminals, current will flow. This is the function of battery. A battery where both terminals are at the same voltage is know as a completely dead battery.
When you have a linked 48 volt system can you use one of the 12 volt batteries as 12 volts or are they all 48 when linked?
You can pull 12 volts off of any single battery in the circuit. The output from each battery never changes, it's always 12 volts. Those batteries are wired together in SERIES to increase the final output voltage of the entire circuit to 48 volts. To demonstrate this, place a voltmeter across the positive and negative terminal of any battery in the system. It will read 12 volts, regardless of which battery you're measuring across. Now place the voltmeter from the positive terminal on one battery and the negative terminal on a different battery. Depending on how many batteries you're measuring across, it will read 24, 36 or 48 volts. Practical application - connect your 12 volt device from the positive terminal to the negative terminal on a single battery.
Is a Terminal an input or output device?
Yes and no. It's...hard to explain. The monitor on the terminal is the Output device and the keyboard on the terminal is the input device.
A rhetorical device used primarily to give a statement a positive or negative slant regarding the topic it is addressing?
A rhetorical device that gives a statement a positive or negative slant is called a loaded language. It involves using words or phrases that carry strong emotional connotations to influence how the audience perceives the information presented. This technique is often used to sway opinions or provoke a specific reaction from the audience.
