Ash-Kennard Posted March 15, 2011 Report Share Posted March 15, 2011 (edited) A resistor is required to limit the current taken by a battery when being charged from a 28 V d.c. source. The battery has negligible resistance and its open-circuit voltage is 19 V. Determine the resistance value, if the current to the battery is to be limited to 24 mA. ive worked it out to be 375 is this right? using 9/24e-3 Edited March 15, 2011 by Ash-Kennard Quote Link to comment Share on other sites More sharing options...
Ash-Kennard Posted March 15, 2011 Author Report Share Posted March 15, 2011 finished it now, got 80%. but dont know what i got right or wrong, any answers on this question would make me happy Quote Link to comment Share on other sites More sharing options...
Shaun H Posted March 15, 2011 Report Share Posted March 15, 2011 Well the relationship R=V/I is correct but I'm not sure how you should calculate the dropped voltage, I'd have gone with 9V too as I guess you want to drive the battery in reverse to charge it? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.