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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
The positive and negative terminals in an electrical device indicate the direction of flow of electrical current. Electrons flow from the negative terminal to the positive terminal, creating an electrical circuit. This polarity helps ensure that the device functions properly and efficiently.
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What are positive and negative terminals?
Positive and negative terminals are locations on a device or component where electrical connections can be made. The positive terminal typically has a higher voltage potential, while the negative terminal has a lower voltage potential. Ensuring proper connection to these terminals is important for the correct operation of electrical circuits.
What is a device that move electrons along a path often a battery?
A device that moves electrons along a path is called a circuit. In a circuit, electrons flow from the negative terminal of a battery, through the components in the circuit, and back to the positive terminal of the battery, creating electrical energy.
What device separates positive and negative charges?
A device that can separate positive and negative charges is a capacitor. Capacitors store electrical energy by storing positive charges on one plate and negative charges on the other plate, creating an electric field between them.
When a device uses two batteries why do they have to be placed positive to negative?
When two batteries are connected in series in a device, they have to be placed positive to negative to increase the total voltage output. This connection method increases the overall voltage by summing the individual voltages of each battery. Placing them positive to negative ensures that the voltages add up instead of canceling out.
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.
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.
What are positive and negative terminals?
Positive and negative terminals are locations on a device or component where electrical connections can be made. The positive terminal typically has a higher voltage potential, while the negative terminal has a lower voltage potential. Ensuring proper connection to these terminals is important for the correct operation of electrical circuits.
How do you induce polarity in galvanometer?
To induce polarity in a galvanometer, you can connect the positive terminal of a power source to one terminal and the negative terminal to the other terminal. This creates a potential difference across the terminals of the galvanometer, inducing polarity in the device.
How can you distinguish between positive and negative terminals?
Positive terminals typically have a red color or a "+" sign indicated, while negative terminals are usually black or have a "-" sign marked. Additionally, positive terminals are connected to the cathode, while negative terminals are connected to the anode in a battery or electrical device.
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 device creates a potential difference in an electric circuit?
A battery is the device that creates a potential difference in an electric circuit. It establishes an electric field within the circuit that allows charges to move from the positive terminal to the negative terminal, creating an electrical current.
Is a zinc anode acts the terminal?
No, a zinc anode does not act as the terminal in a circuit. A zinc anode is used to protect a metal structure from corrosion by sacrificing itself, while the terminal in a circuit is the source of electrical energy that drives the current flow.
What is a device that move electrons along a path often a battery?
A device that moves electrons along a path is called a circuit. In a circuit, electrons flow from the negative terminal of a battery, through the components in the circuit, and back to the positive terminal of the battery, creating electrical energy.
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.
What device separates positive and negative charges?
A device that can separate positive and negative charges is a capacitor. Capacitors store electrical energy by storing positive charges on one plate and negative charges on the other plate, creating an electric field between them.
