Multiple choice general knowledge science & technology

Which one of the following equations could be used to calculate the power absorbed by a resistor?

  1. Power(p) = Current squared(i?) x Resistance(R)

  2. Power(p) = Voltage squared(v?) / Resistance(R)

  3. Power(p) = Voltage(v) x Current(i)

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All three formulas correctly calculate power dissipated by a resistor: P = I²R (from P = VI and V = IR), P = V²/R (substituting I = V/R), and P = VI (definition of power). They're mathematically equivalent through Ohm's Law.

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