Derive the formula for electrical power, which is used only when voltage V and resistance R are known to us.
We know that P = V × I
From Ohm's law, we have
= R ----(1)
or V = I × R
or I =
----(2)
Substituting the value of I in equation (1), we get
P = V ×
or Power, P =
From Ohm's law, we have
= R ----(1)or V = I × R
or I =
----(2)Substituting the value of I in equation (1), we get
P = V ×
or Power, P =
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