Define retrorockets. retrorockets synonyms, retrorockets pronunciation, retrorockets translation, English dictionary definition of retrorockets. n. A rocket engine used to retard, arrest, or reverse the motion of a vehicle, such as an aircraft, missile, or spacecraft. n a small auxiliary rocket...
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( meters have a fuse for the â¦forgetful).   If there is no ampere scale, put a small value precision resistor (like a 0.01 ohm 5-20W)in series with the load and measure the voltage drop across the resistor. Let's say the voltage across the resistor is 1 Volt, then 1V/0.01=100 Amps.