find r from the formula e= ir when e= 20 and i = 4
plug in the numbers
so
20=4r
then divide by 4
20/4
so 5=r
e= ir
20 = 4r
20/4 = r
5 = r
Substitute 5 for r to prove this equation.
20 = 4 * 5
20 = 20
Right.
To find the value of "r" in the formula e = ir when e = 20 and i = 4, you can rearrange the formula and solve for "r". The formula can be rearranged as follows:
e = ir
Divide both sides of the equation by "i" to isolate "r":
e/i = r
Now you can substitute the given values into the equation:
r = 20/4
Simplifying the division:
r = 5
Therefore, when e = 20 and i = 4, the value of r is 5.