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i want to limit the current for a dc circuit, but my book is confusing concerning ohm's law. it leads me to two different equations. it's a 12 volt, 4 amp device. anyway, it's volts/ohms = current right? 12 v/4 ohms = 3 amps ??????? please help clear this up, thanks.
From ur question, i can only find this out that may be the device u are dealing with to limit the current have 4 ohms of resistance, thats why in ur book 12 v/4 ohms = 3 amps is given.so far as the question is related that y its using 3 amps and not 4 amps, so it may be due to safety factor.
according to a rule for safety, one shouldnt use the extreme value for any thing but should go for a little smaller value. here ur extereme value is 4 amps and the moderate good value is 3 amps.