What have you worked out thus far?3A 125V circuit contains a 10W resistor.What resistance must be added in series for the circuit to have a current 0f 5A ?
It doesn't say that the 125V source is applied across the resistor, just that that is the input to the circuit that the resistor is a part of.3A 125V = 375W ..This circuit contains 10W resistor which is dissipating way over its power rating.
Furthermore, if the current is currently 3A, and you want to increase it to 5.. how in the hell would adding more resistance in series do that?
You need to clarify things a bit. What is the circuit that you are starting with? When you say 3A 125V circuit, what do you mean. At first I thought you meant a 125V circuit that is capable of supplying up to 3A (just like I would say that I have several 15A 120V circuits in this house without making any claim that any one of them is actually presently supplying the full 15A). But that doesn't make sense if you are saying you want to increase the current draw above 3A.3A 125V circuit contains a 10W resistor.What resistance must be added in series for the circuit to have a current 0f 5A ?
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