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When you touch the high voltage wires you feel current but when birds sit on them they do not feel currentwhy?
Wiki User
∙ 12y ago
Because you're standing on the ground. But the bird contacts only the wire, so
there's no path through the bird for current to flow from the wire to anywhere else.
Wiki User
∙ 12y ago
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How can energy losses in the national grid be minimised when coverting it into other forms for use by consumers?
Transformers help. Step-up Transformers convert a low voltage and a high current into a high voltage and a low current. The low current loses less energy over long distances. A Step-down Transformer does the opposite and can likely be found somewhere down the street from you (in America they are the large green boxes that you are told never to touch). Also using a wire with a very low resistance, but mostly the transformers.
How does static electricity damage your drive?
Static electricity build-up can be strong enough to melt the microscopic internal circuitry inside micro-chips. It's not the voltage of the static that does the damage - it's the power (amps) behind the charge.
Static discharges are classified as electricity but cannot provide the energy to operate your household devices why?
Because while the voltage of a static charge may be many thousands of volts, there is relatively little current available, especially over time. Even what might feel like a nasty shock when you touch the refrigerator, has minuscule, almost negligible wattage. Perhaps enough to power a wristwatch for a little while but not enough to be useful in a practical sense.
How a meter would be connected in a circuit to measure the voltage at a light bulb?
"Voltage" is the difference in electrical potential between two points in a circuit.If the voltage across the light bulb is what you want, then first make sure thatthe meter in your hand is a voltmeter, and then touch each probe of the voltmeterto one of the connections on each side of the light bulb.If you want to determine whether power is getting to the light bulb, you stillhave to do it by measuring the difference in voltage between two points. Youcould use your voltmeter to measure the voltage between one connection atthe bulb and one connection at the switch. If the power is getting from theswitch to the bulb, then the voltage between the switch and the bulb shouldbe zero (or very small).The voltage between the two connections to the switch should be zero whenthe switch is ON, and mains voltage (115 or 220) when the switch is OFF, etc.I have worked alongside individuals in the past who claimed that they coulddiscern the presence of voltage, and even measure it, by licking their fingerand touching it firmly to the circuit point in question. I don't know how manyof them are still alive, and I strongly recommend AGAINST that technique.
How do you get electric shock?
Electricity tends to travel towards the ground. when we touch an electrical substance, our body acts as a conductor and the current passes through our body to the ground. this is how we get an electric shock.
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.
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.
What can cause death a current or a voltage?
Current causes harm by its heating effects. The flow of electrons heats the conductor - which might be your body - and if it heats it enough the molecules break down and you are cooked. Voltage is harmless. Static electricity generated by (for example) rubbing your shoes on a carpet can amount to thousands of volts, but does no harm. Do not touch electrical conductors regardless of their voltage - they are harmful.
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.
