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Why do signs say Danger High Voltage instead of Danger High current?
Wiki User
∙ 6y 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.
Gudrun Cremin
Wiki User
∙ 15y agoLet's jump around a bit and (hopefully) arrive at an acceptable answer. Ready? Let's go. Voltage is the force that will cause current to flow if it can. Voltage can exist without current flow. It is difference of potential. Just like at the outlet of a wall plug with nothing plugged in. Current is the actual movement of electrons in a conductor. Voltage will cause current to flow it a complete circuit path exists. There can be no current without voltage and a place for current to flow. Let's look at the last element of a basic circuit - resistance. The resistance is just that - the inability of a circuit to perfectly conduct current. It's the opposition to current flow. The last piece of the puzzle is that voltage (in volts) equals current (in amps) times resistance (in ohms). This isn't hard. Just follow along. If we have a 1 ohm resistance, and we have 1 amp of current flowing through it, we have 1 volt pushing that current. It has to be like that. We have to have the 1 volt to get the 1 amp to flow through the 1 ohm. Simple and easy. Now keeping it simple, but without the numbers, if we double voltage, we double current (through the same circuit). Triple the voltage means triple the current. Again, simple and easy. The higher the voltage in a circuit, the more current that will flow through a given resistance. If we don't have a circuit, we can't have current flow. So what good is a warning of high current? It does have some applications, but they are narrow ones. It is the high voltage that has a potential to cause high current if a current path is provided. And it is the high voltage that we must warn anyone around the equipment about. The high voltage is the thing that will reach out and touch us if we do something improperly. It has the potential (because it is a difference of potential) to do some real damage if we give it a chance.
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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).
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.
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
How do you know if a transformer is a step up transformer?
You will most likely see a 'step-up' transformer on neon signs. The next time you're at a restaurant or bar, look at their neon sign. You'll see a black box (4" x 4" x 6"w) connected to the sign (usually). This is the transformer, and it takes 120 volts AC and steps it up to 7500 to 10,000 volts AC. This excites the neon gas and causes it to glow.AnswerA step-up transformer transforms voltage to a higher level. Like 120 volts to 277 volts.AnswerIt is type of transformer which is used to step up the voltage from low to high value in order to make it applicable for high rated appliances.Not only for high rated appliances but also for transmission in power distribution systems. It is critical in this role. Power distribution systems depend heavily on step-up transformers to generate the high voltages needed for more efficient long-distance power distribution. (And yes, there are step-down transformers at the other end to make the voltages more "user friendly" and less dangerous.)
Why do signs read Danger-High Voltage rather than 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.
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.
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 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).
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.
What are the signs your wife is gay?
There are no reliable signs, ask her instead.
What is the purpose of traffic signs?
to warn of a possible danger ahead.
What shape is a danger sign on a French highway?
Danger signs are always triangular, on any roads and motorways in France.
What are the danger signs of cancers?
The first one is probably death but the rest...
What are the signs of bad voltage regulator on 1999 cougar?
It is built into your alternator
Does Home Depot sell danger signs?
The Home Depot, also referred simply as Home Depot, sells different types of danger signs. Depending on content and size, their price is between around $2 and $20.
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.
