Question

A lamp consumes 500 J of electrical energy in 10 s. What is its

power?​

Answer 1

Explanation:

Here, Energy consumed = 500 J; Time duration = 20 s

begin mathsize 12px style Power space equals space fraction numerator Energy space consumed over denominator Time space duration end fraction thin space space space space space space space space space space space equals space fraction numerator 500 space straight J over denominator 20 space straight s end fraction Power space equals space 25 space Watts space or space straight J divided by straight s end style

25 Watts = 25 / 1000 = 0.025 kW

begin mathsize 12px style 0.025 equals fraction numerator Energy space consumed over denominator 2 space hrs end fraction therefore Energy space consumed equals 0.05 space kWh space equals space 0.05 space units end style

Energy consumed in 15 days = 0.05 × 15 = 0.75 units