As known, doc said that the Delorean needed a 1,2 GW *impulse* obviously to travel through time. The problem with the lightning as was seen on the movie, is of course a bolt of lightning has gigantic power numbers (2,000,000 Volts and 100,000 Ampere) but the maximum current flows only for a few ms, making it only a few KWh of energy, so they would need to synchronize the car passing under the wire just when the lightning would strike and with a precision of several ms, so Marty would miss it as he couldn't start the car engine right away. But a high voltage trasmission line would easily give an impulse of 1,2 GW, such lines of course were long in use before 1955. The problem is of course it would be AC. Another problem lies in the depiction in the movie of Doc connecting the connector just in the nick of time, of course that would be impossible as of course the current flows with the speed of light. Another problem is with the plutonium, was it weapon grade plutonium (metallic) or plutonium dioxide, used with uranium dioxide in reactor fuel rods? Just my 2 cents....
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