What Are the 3 Key Formulas for Electrical Power Calculation?

Learn the three essential formulas for calculating electrical power using current, voltage, and resistance in circuits.

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The three formulas for power are: 1. P = IV (Power = Current x Voltage) 2. P = I²R (Power = Current² x Resistance) 3. P = V²/R (Power = Voltage² / Resistance) These formulas can be used interchangeably based on the variables you have available, making it easy to calculate power in electrical circuits.

FAQs & Answers

  1. What is the most common formula for power in electrical circuits? The most common formula is P = IV, where power equals current multiplied by voltage.
  2. How do I calculate power if I know current and resistance? You can use the formula P = I²R, where power is current squared times resistance.
  3. Can power be calculated using voltage and resistance? Yes, the formula P = V² / R allows calculating power using voltage squared divided by resistance.
  4. When should I use each power formula? Use the formula based on available variables: P = IV when both current and voltage are known, P = I²R if current and resistance are known, and P = V² / R if voltage and resistance are known.

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