codan
New Member
Hi Everybody,
I have attempted to calculate the internal resistance of a carbon cell given in a question.
I am not quite sure if i have it correct but it seems to work out, i have had trouble with this one.
Could you check my answer & see if i am on the right track?
The question is:
Determine the Internal Resistance of a carbon cell if the open circuit voltage is 1.7v & when a 10ohm resistor is connected across the battery terminals the voltage drops to 1.26v.
My Answer is:
I = V/R = 1.26v/10Ω so I =.126A
r = E - V /I = (1.7v - 1.26v) /.126A =3.49ohms
Then using to verify things:
E= V+Ir = 1.26v + (.126A*3.49Ω )=1.7v
Thank You
I have attempted to calculate the internal resistance of a carbon cell given in a question.
I am not quite sure if i have it correct but it seems to work out, i have had trouble with this one.
Could you check my answer & see if i am on the right track?
The question is:
Determine the Internal Resistance of a carbon cell if the open circuit voltage is 1.7v & when a 10ohm resistor is connected across the battery terminals the voltage drops to 1.26v.
My Answer is:
I = V/R = 1.26v/10Ω so I =.126A
r = E - V /I = (1.7v - 1.26v) /.126A =3.49ohms
Then using to verify things:
E= V+Ir = 1.26v + (.126A*3.49Ω )=1.7v
Thank You