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Results tagged with resistors
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user 248740
A resistor obeys Ohm's law (\$\small V=I\cdot R\$); the current through it is equal to the voltage across it divided by the resistance (equivalently \$I=\frac{V}{R}\$).
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How to drop the voltage of a power supply?
I have a DC power supply which outputs 21V 2.2A.
I want to use it to charge a car battery so I need to get the voltage down to 14V.
I have a 3.9Ohm 100W resistor but am am I correct that that would dr …
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