69.
It may help you to isolate the unknown quantity in the formula
if you will compare the process with another process you
already understand.
Remember the "magic circle" for Ohm's law?
What is the formula
if you wish to solve for E?
69a. E = I X R
b.
What is the formula if you wish to solve for R?
_____________________
69b.
70.
Now, isolate I, as you did E and R in the preceding steps.
_____________________
70.
71.
After the unknown quantity has been isolated to the left of the
equal sign, substitute known values for the symbols to the
right of the equal sign and solve mathematically.
Solve for R, when e = 100 and I = .2
Answer here. ________________
Solve for E when R = 250 and I = 4
Answer here. ________________
IT0350
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