Which one of the following formulas does *not* represent electrical power?
I²R
IR²
VI
V²/R
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2021
– The basic formulas for power are P = VI, where V is voltage and I is current.
– Using Ohm’s Law (V = IR), we can derive other forms:
– Substituting V = IR into P = VI gives P = (IR) * I = I²R. (Option A)
– Substituting I = V/R into P = VI gives P = V * (V/R) = V²/R. (Option D)
– Option C, VI, is also a standard formula for power.
– The unit of power is the Watt (W).