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Why do signs read Danger-High Voltage rather than Danger-High current?
Wiki User
∙ 12y ago
Electricity is transferred with high voltage and low current to reduce transmission loss ( I2R , where R= resistance of wire).
As high voltage is present in transmission lines, Danger-high voltage is written.
Wiki User
∙ 12y ago
Wiki User
∙ 13y agoThe point of such a sign is to alert anyone and everyone that there is danger, not to test the knowledge of those reading it. For whatever reason, 'high voltage' has come to mean danger to most people.
Wiki User
∙ 13y agoThere is no current until a conductor connects two points that are at different voltages.
The danger is that you may become the conductor, if you accidentally connect a
high-voltage point to the ground, causing a current to flow through you, which
wreaks all kinds of havoc with the muscles and nervous system.
Wiki User
∙ 8y agoIf there were no load on the high voltage line there would be no current flow. The potential of the voltage is on the circuit all of the time, if the circuit is closed, regardless of whether there is a current flow or not. Hence the sign that states danger high voltage.
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What are the hand seal combinations for chidori current?
chidori hand signs the use presure.
How is the plus and minus voltage sign for resistance voltage drops for battery voltages and currents be determined?
The plus and minus voltage sign for resistance voltage, drops for battery voltages, and drops for currents is determined by convention. You can use whatever method you want - so long as your use is consistent, your analytical results will be correct for you.The commonly accepted convention, however, is best. This way, other people reviewing your results will not be confused unless, of course, they use an atypical convention.Electric current flow is electron flow. The battery terminal marked "negative", or the cathode, is the source of electrons, and those electrons are drawn to, and flow towards, the "positive" terminal, or anode.Consider a simple circuit, consisting of a battery in series with a resistor. Draw the battery on the left, with the anode up. Draw the resistor on the right. Connect the anode to the top of the resistor, and the cathode to the bottom of the circuit. (Actually, this is also a parallel circuit, with the battery in parallel with the resistor. It depends on how you see it, because this is a simple circuit.)Current flows out of the bottom (cathode, negative) battery terminal, into the bottom of the resistor, up through the resistor to its top, over to the left, and into the top (anode, positive) battery terminal, and down through the battery, completing the circuit at the cathode. This is counter-clockwise, if you have drawn the circuit as stated.If you place a voltmeter across the battery, you will see that the anode (top) is more positive than the cathode. If you place a voltmeter across the resistor, you will see that the top is more positive than the bottom. It does not matter if you measure across the battery or the resistor, the voltage will be the same. If you place the voltmeter across the wire on the bottom, or across the wire on the top, you will see that the voltage is zero.With the preliminaries out of the way, now to the convention.Current flow is counter-clockwise, from cathode to anode. If you were to draw a current arrow, you could draw it counter-clockwise, down through the battery and up through the resistor. You would label the first point that the current encounters (the bottom of the resistor) as negative, or minus. As the current goes through the resistor, it becomes more positive, so you would label the top of the resistor positive, or plus. Go over to the anode. That is also plus. The current is made more negative due to the battary being a source, rather than a load, so the cathode is minus.These pluses and minuses are relative to each other, and they are also relative to some common reference point, said point by convention being the cathode. In this simple circuit, there is only one point that has any voltage different than the cathode, and that is the anode, so this distinction might be vague.Consider then, the case where the resistor is actually two resistors in series. Again, the bottom resistor starts minus on its connection to the cathode, it becomes more positive as the current goes up, making the top of the bottom resistor plus. The bottom of the top resistor is minus, because current is flowing into it, and it becomes more positive as the current goes up, with the top of the top resistor plus.When you measure voltage across an element, you see the voltage for that element. If, instead, you measure the voltage relative to the common reference point, and there is more than one element between the voltmeter's leads, you add up the voltage rises or drops to figure out what to expect. In fact, this is the basis for Kirchoff's voltage law - that the signed sum of the voltage drops around a series circuit always adds up to zero.So, this preliminary convention is that current flow leaves the minus terminal of a voltage or current source, and enters the minus terminal of a voltage or current load. It then enters the plus terminal of a voltage or current source, and leaves the plus terminal of a voltage or current load.Now, to confuse you, another convention states that current flows from plus to minus, not from minus to plus. This means that current leaves the plus terminal of a source, and enters the plus terminal of a load, and it enters the minus terminal of a source and leaves the minus terminal of a load.It does not really matter which convention you use. The positions of the plus and minus signs will be the same - its just that the current arrow will point in the opposite direction - in this example, clockwise instead of counter-clockwise. What is important is to be consistent in your use of the plus or minus sign as the current enters and leaves a source or a load.The convention of current flow is arbitrary. So long as you are consistent in your application, you will get the correct results.It is generally accepted that current flow is electron flow, which means that current flows from the negative side of a voltage or current source towards the positive side.Often, however, current is considered to flow from positive to negative. While this makes perception in circuit analysis more straightforward, it does not change the analytical results.
What did the signs that the Gosselins put in their front yard in 2008 say?
Before the Gosselins moved to their current home, they put signs in the front yard of their house that said:STOP!Do not stop in front of our house.Do not take pictures.Do not stop and talk to us.
Explain how positive and negative voltages can exist at the same time in a circuit but with only one voltage source?
Voltages are relative. You could, for example, build a simple resistor voltage divider with two resistors and choose the middle point as ground. You would have minus and plus voltages relative to that point then.It is also possible to generate minus voltage (relative to voltage source) with more complex circuitry from a single source. The circuit is called a charge pump.AnswerPositive voltage exists between the power source, and the load (Load being whatever device is being powered). Negative voltage exists between the load and the ground, or negative terminal.AnswerYour question (and the two answers, above) confuses potential difference with potential. 'Voltage' is synonymous with 'potential difference', not 'potential'.The two answers, above, are each describing 'potential', not 'voltage'. There is no such thing as a 'positive' or 'negative' voltage in the 'charge' sense. Voltages are absolute, whereas potentials are relative. So, if one point has a potential of +10 V with respect to, say, earth, and a second point has a potential of -15 V, then the voltage (potential difference) between them is 25 V (no sign!).We can, on the other hand, apply signs to voltages if those signs are used to describe 'sense' or 'direction' in which a voltage is acting. For example, if two batteries are wired in opposition, we can say that the second voltage is acting a 'negative' sense to the first voltage.We do this when we apply Kirchhoff's Voltage Law to a series circuit, when we write an expression such as: V1 +V2 -V3 = 0In the above equation, we are saying that voltages V1 and V2 are acting in one direction, while voltage V3 is acting in the opposite direction.
If you connect two identical AC to DC converters together in series does the output amperage change?
Wiring the DC outputs of the 2 converters in series would double the DC output voltage but not the current (amperage). The maximum safe output current would just be the same as the rating of the convertor which has been designed for the least current output. So be sure to check the rating plates of the two convertors to see which one has the lowest output current: that is the maximum current your load device should take. Yes you can do them in series. You take the positive of one and connect it to the negative of the other, then the other positive and negative are still pos. and neg.,,,,,,,,,,,,,,, This will double the VOLTAGE but keep the AMPERAGE the same. ,,,,,,,,,,,,,,, I do not know if it will actually work or not on A transformer though. For parallel : You connect the pos. to pos. and neg. to neg., This will keep the VOLTAGE the same, and double the AMPERAGE.,,,,,,,,,,,,,,,, I don't know if this will work or not either. This will work on BATTERIES, I am not sure about transformers. Re the parallel case mentioned above, that is a very well-worded answer because it is cautious about saying what is likely to happen! To illustrate that case: you have a 12 volt DC car light bulb which is rated at 60 Watts so it takes a current of 5 Amps. You want to power-up the bulb from the mains using two AC to DC converters which each have a 12 volt DC output voltage but a rated output current of only 2.5 Amps each. Wiring the DC outputs in parallel could work to allow double the current output of a single converter to be produced BUT ONLY IF THE TWO CONVERTERS WERE CAREFULLY WIRED with their DC + terminals (or wires) connected together and their DC - terminals (or wires) connected together. *** (See note below.) However, whilst the resulting output voltage might be close to the output voltage of one of the converters, that cannot just be assumed! Particularly if the converters were not identical (if they were of different makes and/or power outputs, say) then the different slew rates of the convertors could cause the final output voltage to hunt around as the two converters tried to control each other. This voltage hunting would be accompanied (or caused by!) a current circulating between the two converters that was much higher than they were designed to handle. If they were badly matched such an unstable situation could lead to serious overheating and maybe a burnout of one of the convertors, if not both, even if there was no actual visible smoke and/or fire. (However this is not likely to be as bad as the situation described in the Note *** below.) Such voltage hunting and higher than normal output current circulating between the converters (please note this does not involve the attached load - say a light bulb - at all!) might not be visible using normal test meters but, if present, would be seen on an oscilloscope. To be safe - and to help avoid any overheating or burning-out of one or both of the converters - if you wished to try using them in parallel it would be very wise to wire a proper lab-type variometer into the AC mains feed and, whilst everything is switched off, attach your desired load to the parallel-connected outputs of the two AC to DC converters. Then do this test: very slowly bring up the AC supply voltage from zero, measuring both the DC output current and voltage of each converter all the time. You should also watch and feel the adapters throughout the test to be able to detect any signs of overheating well before the full mains voltage is tried. If you don't have the right kinds of controllers and instruments to measure what is really happening it would be best not even to try to do the above parallel-connecting "blind" at all. ("Blind" meaning "without instruments".) Instead the best plan would be to obtain a single AC to DC converter which has been designed to give the desired output current at the desired voltage. *** Note : IF THE CONVERTERS WERE WRONGLY WIRED with the DC + terminals (or wires) of one connected to the DC - terminals (or wires) of the other THERE WOULD BE A MASSIVE CURRENT CIRCULATING BETWEEN THE TWO CONVERTORS AND, IF FULL MAINS VOLTAGE WERE SUPPLIED, BURNOUT IS PRETTY MUCH GUARANTEED!
Why during measurement the measured voltage and currents have negative sign?
Because of the polarity of the circuit. The signs of measured current and voltage depends on the direction of the current and voltage.
How are the plus and minus voltage signs determined for resistors?
Resistors have no polarity. The voltage across a resistor is determined by the direction of current flowing through that resistor (and vice versa).
The damaging effects of electric shock result from the current that flows in the body.Why then do signs read Danger-High Voltage rather than Danger-High Current?
It is true that the magnitude of current flow through the body determines the effects that occur. The path taken through the body is also responsible for the final outcome. For example the extremities will survive with higher current flow than the heart. There are a lot of factors that effect the magnitude of current flow, body resistance can be one variable. This changes from person to person, and from day to day , as well as conditional. For example wet hands will reduce the resistance to current flow and increase the magnitude of current through the body, dry, dirty hands/skin will have the opposite effect. With all other factors being equal (body resistance, path of current etc) The one variable that will 'push' more current through the body is the voltage level. Low voltage (less than 50V) typically has little effect. Where high voltage such as 4160V dramatically decreases your odds of survival.
How does tha current flows in the circuit?
Most people agree that current flows from the negative (cathode) terminal of the voltage source, through the load, and back to the positive (anode) terminal of the voltage source. This is because it is accepted that current is a flow of electrons. However, most analyses techniques use the convention that current flows from anode to cathode. It is simply a convention. So long as you are consistent in your usage of signs, you will be OK.
Why do signs say Danger High Voltage instead of Danger High current?
Electricity is transferred with high voltage and low current to reduce transmission loss ( I2R , where R= resistance of wire). As high voltage is present in transmission lines, Danger-high voltage is written.
What are the signs of bad voltage regulator on 1999 cougar?
It is built into your alternator
Can kirchoff's voltage law be used to determine voltage drop?
Yes. Kirchoff's Voltage Law states that the signed sum of the voltage drops going around a series circuit is zero. Thus, if you know all but one, you can figure it out. You simply add what you know up, and what is left is the last drop. Don't forget to be consistent in your use of signs. If, for instance, you show a voltage or current source as a voltage rise, then it must be considered to be a negative voltage drop. Or vice versa, as the case may be.
Does the neon power supply for those beer signs in bars output high voltage AC or DC?
High Voltage AC.
If it is the current that causes the damage why do dangerous places have signs warning you of the high voltage?
True, current causes the damage. But current cannot flow unless there is voltage present to push it. Imagine a live, exposed wire sticking out of a wall. It has voltage, but that's all. No current flows until the circuit is completed by something. That something can be you! At the instant you touch the wire, current flows from the wire, through you, and into the ground. If the current is high enough, it can injure or even kill you. The higher the voltage, the more current will flow once you touch the wire. A sign warning of high current would be inaccurate, because before you touch the wire, the current is zero. And low voltages cause very little current to flow through a human body under normal conditions. So, high voltage does indeed pose a potential threat, and thus warrants a warning. It's like the flammable warning on a can of gasoline. Right now, it just sits there. It is not hot, there is no flame. Yet. But we both would agree it has the potential to burn us to a crisp under the right conditions. Gasoline is not what hurts you. The flame it produces is what does the damage, yet we still put the warning on the gasoline. Voltage is like that. It's the current (flame) that does the damage, but it comes from the voltage (gasoline), so that's what we warn of.
What are the symptoms of a faulty voltage regulator?
Unpredictable engine performance and pulsating lights are some of the signs of a faulty voltage regulator. A dead battery is also a symptom of a faulty voltage regulator.
What does current s and s mean?
current s and s is an abbreviated way of saying current signs and symptoms
How many amps in 8 ohm using ohm's law?
You must know the applied voltage to determine the answer. According to Ohm's law: I = E/R (current equals voltage divided by resistance) So, if the voltage were, say, 16 volts, then the current through the 8 ohm resistor would be two amps: 2 = 16 / 8
