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High voltage power lines12/28/2023 ![]() Scientists normally report data in millionths of a tesla, or microteslas (µT). It can also be represented as kg⋅s −2⋅A −1. The tesla (T) is the SI (International System of Units) unit used to describe the strength of magnetic fields. ![]() People in Canada live closer to the North geomagnetic pole, and can receive up to 60µT. People living far from the earth’s magnetic poles receive on average 30µT. Where you live in the world probably makes a big difference to the EMFs you receive. This is still ten to 20 times more exposure than you would get inside the average home in North America. For example, at 25 m away from the most powerful line you would receive about 1-2µT. This amount quickly decreases as you move away from high voltage lines. If you stood directly underneath the highest voltage power lines though, you could receive a maximum of 100µT. Household appliances usually produce fields measuring between 0.01 to 0.02 microteslas (µT). The EMFs that come from high-voltage power lines are a lot stronger than those around household appliances. The flow of energy is directed through the fields from the dry cell towards the load (light bulb). Magnetic field lines form circular loops around the wire. Measured in volts per metre (V/m) or Newton/coulombĮlectric field lines are directed away from positively charged source charges and toward negatively charged source charges. Strength of field varies with power consumptionįield can do work (the speed and direction of particles changes)įield cannot do work (speed of particles remain constant) The greater the current, the stronger the fieldĮxists even when there is no current flowing The higher the voltage, the stronger the field The NCI also explains that EMFs are produced by many things, like power lines, electrical wiring and household appliances like televisions and microwaves.Įlectromagnetic fields combine electric fields and magnetic fields. The US National Cancer Institute (NCI) describes electromagnetic fields as “invisible areas of energy (also called radiation) that are produced by electricity”. Power lines are surrounded by an electromagnetic field (EMF) that stretches in all directions. ![]() Open Professional Learning × Close Professional LearningĮlectricity generation, transmission and distribution (Let’s Talk Science using an image by mathisworks via iStockphoto). If the power company won the suit, the fellow must have been bleeding power from the line: set up an AC circuit which drew power directly, by a capacitive or inductive coupling without touching the line.Open Educational Resources × Close Educational Resources After we reach the amount of power we want, we utilize it in a spurt and that activates a sensor or some very small communication device. We developed some ways using a super-capacitor where we can store this energy. ![]() It’s like having to collect small droplets of water in a single cup. The third trick we utilized was finding efficient ways to keep storing this energy. We developed in-house ink jet printer technology where we can ink jet print circuits or metals on very low cost substrates like paper or plastic. We managed to do this in a very cost-effective and environmentally-friendly way. To do that, we developed extremely wide-band antennas. In order to have a significant amount of power, we thought we should be able to scavenge energy from the whole frequency range. Previous efforts were scavenging only from narrow bands. There exists a way to harvest electromagnetic energy which is otherwise lost, and thus it is not stealing from anybody. ![]()
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