<p>"a 100ohm resistor is connected in series to an unknown resistor with a 10 volt battery source. There is a potential drop of 4 volts across the 100 ohm resistor. what is the resistance of the unknown resistor? "</p>
<p>thanks</p>
<p>I think the resisters would be in proportion (since the current would be the same), so 4/100 = (10-4)/x --> 4/100 = 6/x so I believe the answer would be 150 ohm.</p>
<p>yeah, you're right, thanks. I have another question...well these are basic things i want to clarify</p>
<p>how do you find the north pole of a solenoid
current flows from positive to negative?</p>
<p>I think current is the "flow of positive charge" but I'm not 100% sure of that.</p>