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What is touch potential?
Touch potential is the voltage a person can be exposed to if they touch an energized object while also being in contact with the ground. It is the difference in voltage between the energized object and the ground that the person is touching. Touch potential can pose a dangerous risk of electric shock in certain situations.
Is it safe to touch the positive terminal of a car battery?
No, it is not safe to touch the positive terminal of a car battery as it can cause electric shock or burns due to the high voltage and current present. It is important to always handle car batteries with caution and use proper safety precautions.
Why do you get an electric shock by touching a bare wire?
electric shock is a physiological symptom caused by an electric current flowing though the body. the current causes heating and, at higher levels, burns, and eventually death. The bare wire has an electric potential of some substantial voltage above ground. This potential causes a current to flow through your body to ground. if some other part of your body is not connected to ground, no current will flow. The current causes burning in your blood stream, your nervous system, and in you tissue. the current that flows through your body needs to be above about 10mA for you to perceive it as a shock. The voltage required to produce this current, by ohms law, depends upon the resistance between the point of contact and ground.
Will you get shocked if you touch just the hot wire?
Yes, you can get shocked if you touch just the hot wire because it carries electrical current.
How do you measure the voltageof a lightbulb?
You can measure the voltage of a light bulb by using a multimeter set to the voltage setting. Simply touch the positive and negative probes of the multimeter to the base of the light bulb where it connects to the socket to measure the voltage across the bulb.
Why can animals sit on high voltage electrical lines?
Animals can sit on HIGH VOLTAGE Electrical lines. It does not give any current to animals or birds unless the circuit is complete. It is essentlal to complete the electrical circuits for making any current. When bird sit on the line / conductor the only legs of birds touched single line and it does not touch the other two conductors below upper line/conducotr , which does not make circiuit complete and birds / animals does not feel current.
How do birds not get electrocuted on power lines?
Actually if we were to sit on a power line and not touch anything else like the birds do we would not get electrocuted.The current a flow of electrons,flows along a path of least resistance the electrons want to get to where they are going in the easiest possible way. Electricity flows from one voltage to another value of voltage. For the birds, the power lines have the same voltage -- so the birds are safe. Don't approach power lines, because humans come from the ground, which is a sink for the current.
Why do birds not get sparks when flying near high-voltage lines?
If the bird is large enough to touch two different phase voltage lines or a grounded conductor ans a voltage line simultaneously it will be electrocuted. Just touching one line (and not a conductor leading to the ground) will not create a potential difference and so no current will flow.
Why do big birds get killed by power lines but little birds don't?
The wingspan on a big bird is large enough to touch two wires at once. Any difference in voltage between the wires will cause current to flow through the bird, perhaps killing it. Small birds can only touch one wire at a time.
What happens to the applied voltage when a change in circuit resistance occurs?
When a dc supply is connected to a resistor, current flows. The current in amps is equal to the supply voltage divided by the resistance in ohms. The power used is the voltage times the current, and that appears as heat in the resistor, which might become hot to touch.
Birds sitting on a single powerline don't get shocked but if they were to place 1 foot on each of two lines blank word flow between them and they would receive a terrible shock?
Birds sitting on a single powerline don’t get shocked because they are at the same electrical potential as the wire, so there is no voltage difference to create a current through their bodies. However, if a bird were to touch two powerlines simultaneously, it would create a path for electricity to flow through its body due to the voltage difference between the lines. This can result in a dangerous shock, as the current would seek to balance the voltage difference.
What are the is electrical relays and its principals and operation?
An electrical relay uses a low voltage, low current signal to control an electromagnet. When current passes through the electromagnet, it attracts the spring loaded arm with contactors, which will touch some stationary contactors, closing a circuit on a higher voltage/high current circuit. An example of this is when your thermostat 'tells' the air conditioner to turn on. The voltage & current from the thermostat are low, while the voltage & current necessary to run the air conditioner's compressor are high..
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.
When birds sits on a cable it gets shocked by a current?
In simple words we can say that when birds sit on the single conducting wire then there is not closed path&when it touch both conductor at a time then closed path forms & birds die due to shock
Do current apps work on the ipod touch 1st generation?
it depends which apps, for example, angry birds would work but an app that has to have a camera wouldn't.
Why can birds sit on power lines without being shocked?
The short answer is they are not grounded. You can hang from a line also and not be harmed, but don't try it as if you do it wrong you can be severely hurt or killed. So what does "they are not grounded" mean? Electric current flows from high voltage to low voltage. The power line is high voltage. The earth, or ground, is low voltage. Anything in contact with the earth is also at the same low voltage. That is why there are insulators between the lines and the poles. The higher voltage the lines, the bigger the insulators. You can see this for yourself by looking at a high voltage tower versus a typical wooden power poll. When the bird lands on the line, it is only in contact with the line. There is no path to the lower voltage ground for the electrical current to flow thorugh. No current flow means no harm to the bird. People get into to trouble with power lines because they are almost always in contact with the pole or the ground when they, or something they are holding, touch the line, which means the current flows through them to the lower voltage. Note that the lower voltage does not have to be zero volts. It just has to be lower than the high voltage for the current to flow. It is not the voltage that kills you. It is the combination of voltage and current. No current or low current, no harm. When you scoot your feet on the carpet on a dry day and touch the door knob, a spark jumps and you feel a small snap. Your skin is charged up to 10's of thousands of volts, but there is very little current flow, so no harm is done. Hope this helps.
Why high voltage line workers keep left hand in pocket?
If you touch a power line with one hand, the current goes through your body. If you touch it with two hands, the current goes through your heart. They keep one hand in their pocket to prevent touching the line with both hands.
