|If you have a
parallel circuit like this, what is the total
resistance and voltage? And voltage and
current on A, B, and C?
In order to find out the total voltage, we have to
find out the total resistance. Using equation 5, we
can find out the total resistance.
1/R = 1/15 + 1/15 + 1/30 = 5/30, R = 6 ohm
||Then using ohm's law,V =
I R, we can find out the total voltage.
V = 5 * 6 = 30 V
Using equation 4, we now know the voltage on A, B,
and C, which is 30 V each. Using ohm's law again, we
can find out the current on A, B, and C.
IA = 30/15 = 2 A,
IB = 30/15 = 2 A,
IC = 30/30 = 1 A
When you add up all the current (using equation
6), we get 5 A which is
the total current.