CLASS10 · Physics · Electric Power Formulas

Exercise and reference answers

Matching pairs

1. Left

   P = V × I

   Right

   Power = voltage × current

2. Left

   P = I² R

   Right

   Power dissipated in a resistor (Joule heating)

3. Left

   P = V² / R

   Right

   Power expressed via voltage and resistance

4. Left

   Energy E = P × t

   Right

   Total electrical energy used

5. Left

   1 kWh

   Right

   3.6 × 10⁶ joules

6. Left

   SI unit of power

   Right

   Watt (W)

Instructions

Match each formula to the power-energy relation it expresses.