mpaap New Member Sep 19, 2009 #21 well now that's a part where im not so good in.. If Vdrop is 5ohms * 4A then it's 20V so R12 = 20V ? R1 = R2 = 10V ?
well now that's a part where im not so good in.. If Vdrop is 5ohms * 4A then it's 20V so R12 = 20V ? R1 = R2 = 10V ?
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #22 mpaap said: well now that's a part where im not so good in.. If Vdrop is 5ohms * 4A then it's 20V so R12 = 20V ? R1 = R2 = 10V ? Click to expand... No, dont forget you have calculated the parallel value for R1 and R2 so its just 5 ohms,, as U1 =44V the the drop across R1 and R2 is 20V. You now know the voltage across R6, which is 44-20 = 24V so calculate the current thru R6.....?
mpaap said: well now that's a part where im not so good in.. If Vdrop is 5ohms * 4A then it's 20V so R12 = 20V ? R1 = R2 = 10V ? Click to expand... No, dont forget you have calculated the parallel value for R1 and R2 so its just 5 ohms,, as U1 =44V the the drop across R1 and R2 is 20V. You now know the voltage across R6, which is 44-20 = 24V so calculate the current thru R6.....?
mpaap New Member Sep 19, 2009 #23 now it's getting confuseing. okei, R6 is 10 ohms and voltage is 24 ohms.. then i think I = 10 / 24 = 2,4A ? am i right?
now it's getting confuseing. okei, R6 is 10 ohms and voltage is 24 ohms.. then i think I = 10 / 24 = 2,4A ? am i right?
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #24 mpaap said: now it's getting confuseing. okei, R6 is 10 ohms and voltage is 24 ohms.. then i think I = 10 / 24 = 2,4A ? am i right? Click to expand... Good, thats correct.. 2.4A So the next step is to work out the current thru R3 R4 and R5 You have already worked out that all together R3,4 and 5 are 15Ohms so whats the current thru this 15 ohms, you know the voltage is 24V I = 24V/15R =...... ? Last edited: Sep 19, 2009
mpaap said: now it's getting confuseing. okei, R6 is 10 ohms and voltage is 24 ohms.. then i think I = 10 / 24 = 2,4A ? am i right? Click to expand... Good, thats correct.. 2.4A So the next step is to work out the current thru R3 R4 and R5 You have already worked out that all together R3,4 and 5 are 15Ohms so whats the current thru this 15 ohms, you know the voltage is 24V I = 24V/15R =...... ?
mpaap New Member Sep 19, 2009 #25 okei, 24V / 15R = 1,6 ohms so R345 = 1,6 ohms ? o yes, my bad.. 1,6A ? Last edited: Sep 19, 2009
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #26 mpaap said: okei, 24V / 15R = 1,6 ohms so R345 = 1,6 ohms ? Click to expand... Its actually 1.6 Amps not ohms. You are almost there! You know now the current is 1.6Amp so work out the voltage drop across the R3 resistor Vdrop= 1.6A * 10R = ........ ?
mpaap said: okei, 24V / 15R = 1,6 ohms so R345 = 1,6 ohms ? Click to expand... Its actually 1.6 Amps not ohms. You are almost there! You know now the current is 1.6Amp so work out the voltage drop across the R3 resistor Vdrop= 1.6A * 10R = ........ ?
mpaap New Member Sep 19, 2009 #27 Voltage drop across the R3 = 1.6A * 10R = 16V ? that means R3 is 16V ? So R4 = R5 = 4 V? Last edited: Sep 19, 2009
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #28 mpaap said: Voltage drop across the R3 = 1.6A * 10R = 16V ? that means R3 is 16V ? Click to expand... ok, just one more step and youre done. Across R4 and R5 is 24V - 16V = 8V so now work out the current thru R4.. I= 8V/10R =..... ? The R5 is the same.! Now fill in the question list and post it.
mpaap said: Voltage drop across the R3 = 1.6A * 10R = 16V ? that means R3 is 16V ? Click to expand... ok, just one more step and youre done. Across R4 and R5 is 24V - 16V = 8V so now work out the current thru R4.. I= 8V/10R =..... ? The R5 is the same.! Now fill in the question list and post it.
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #30 mpaap said: R4, i = 0.8 a? Click to expand... Correct. So now put the values you have calculated into that circuit diagram you first posted, lets see it.
mpaap said: R4, i = 0.8 a? Click to expand... Correct. So now put the values you have calculated into that circuit diagram you first posted, lets see it.
mpaap New Member Sep 19, 2009 #31 I = 4A, U = 44V and R = 11 ohms I1= 2A U1= 10V I2= 2A U2= 10V I3= 1,6A U3= 16V I4= 0,8A U4= 8V I5= 0,8A U5= 8V I6= 2,4A U6= 24V Am i right?
I = 4A, U = 44V and R = 11 ohms I1= 2A U1= 10V I2= 2A U2= 10V I3= 1,6A U3= 16V I4= 0,8A U4= 8V I5= 0,8A U5= 8V I6= 2,4A U6= 24V Am i right?
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #32 mpaap said: I = 4A, U = 44V and R = 11 ohms I1= 2A U1= 10V I2= 2A U2= 10V I3= 1,6A U3= 16V I4= 0,8A U4= 8V I5= 0,8A U5= 8V I6= 2,4A U6= 24V Am i right? Click to expand... All ok except U1 and U2, remember the first voltage drop you calculated..
mpaap said: I = 4A, U = 44V and R = 11 ohms I1= 2A U1= 10V I2= 2A U2= 10V I3= 1,6A U3= 16V I4= 0,8A U4= 8V I5= 0,8A U5= 8V I6= 2,4A U6= 24V Am i right? Click to expand... All ok except U1 and U2, remember the first voltage drop you calculated..
mpaap New Member Sep 19, 2009 #33 o yes.. U1 = U2 = 20V.. im going to do it one more time by myself. Thanks a lot for your help I was looking for help from everywhere.
o yes.. U1 = U2 = 20V.. im going to do it one more time by myself. Thanks a lot for your help I was looking for help from everywhere.
ericgibbs Well-Known Member Most Helpful Member Sep 19, 2009 #34 mpaap said: o yes.. U1 = U2 = 20V.. im going to do it one more time by myself. Thanks a lot for your help I was looking for help from everywhere. Click to expand... Well done. Thats it, now rework all the calculations from the beginning so that you fully understand. You can use the same method to solve most resistor circuits. Good Luck.
mpaap said: o yes.. U1 = U2 = 20V.. im going to do it one more time by myself. Thanks a lot for your help I was looking for help from everywhere. Click to expand... Well done. Thats it, now rework all the calculations from the beginning so that you fully understand. You can use the same method to solve most resistor circuits. Good Luck.
mpaap New Member Sep 19, 2009 #35 Thanks ericgibbs i did it this time alone, and yout method rocks !! i don't know how to thank you man Respect+ ! Edit: Does someone have any that kind exercises that i could do? I would really like it... going to have big test soon. Last edited: Sep 19, 2009
Thanks ericgibbs i did it this time alone, and yout method rocks !! i don't know how to thank you man Respect+ ! Edit: Does someone have any that kind exercises that i could do? I would really like it... going to have big test soon.
EN0 Member Sep 19, 2009 #36 You want practice, eh? Here you go! Ohm's Law Practice Problems #1 - Learning Activity Ohm's Law Practice Problems #2 - Learning Activity Ohm's Law Practice Problems #3 - Learning Activity Ohm's Law Practice Problems #4 - Learning Activity Ohm's Law Practice Problems #5 - Learning Activity Here is the main source: **broken link removed** If that's not enough, let me know. Last edited: Sep 19, 2009
You want practice, eh? Here you go! Ohm's Law Practice Problems #1 - Learning Activity Ohm's Law Practice Problems #2 - Learning Activity Ohm's Law Practice Problems #3 - Learning Activity Ohm's Law Practice Problems #4 - Learning Activity Ohm's Law Practice Problems #5 - Learning Activity Here is the main source: **broken link removed** If that's not enough, let me know.