/technologies/power-management/b/blog/posts/stanford-researchers-redefine-electricity-on-the-goStanford University consistently brings us innovation. It’s astounding. An example of that is the team of engineers who created a clever way to transmit electricity wirelessly. The technology could send electricity to moving electric cars, drones anden-USTelligent Community 12https://community.element14.com/technologies/power-management/b/blog/posts/stanford-researchers-redefine-electricity-on-the-goTue, 16 Jun 2020 09:36:02 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:0a3c83d3-62cd-4e9f-8c8f-56105f9fdc1dmichaelkellett1<p>Oh come on Cabe - engage brain here !</p><p>&nbsp;</p><p>All numbers approximated to about 1 sig fig</p><p>4 feet = 1.2m</p><p>70 mph = 31m/s</p><p>Time through charger = 0.04s</p><p>Assume charge power of 1MW at 100% efficiency - car receives 1e6 * 0.04 = 4e4 joules</p><p>4e4 joules = 4e4/3.6e6 = 0.01kWh</p><p>So a car needing a reasonable 50kWh charge needs to pass the charger 5000 times !</p><p>&nbsp;</p><p>Or it needs pass 5000 chargers - spanning a distance of 40000 feet = 8 miles</p><p>&nbsp;</p><p>At 70mph the cars should be at least 250 feet apart so only 160 cars can be in the charging zone at a time - so only 3.2% of the chargers are active at time.</p><p>&nbsp;</p><p>Now just how much do you think 1MW remote chargers will cost, could they be safe ..........</p><p>&nbsp;</p><p>The car owners could just plug them in at night.</p><p>&nbsp;</p><p>A better scheme might be to give those guys washing windscreens at junctions a nice 100kW cable to plug into your car while they wash. Proven technology, jobs for the unskilled, no nasty magnetic fields.</p><p>Can I have a Nobel prize please <span>[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-0a3c83d3-62cd-4e9f-8c8f-56105f9fdc1d/contentimage_5F00_1.png:16:16]</span></p><p>&nbsp;</p><p>MK</p><img src="https://community.element14.com/aggbug?PostID=9499&AppID=4&AppType=Weblog&ContentType=0" width="1" height="1">