Question

a lamp has the power of 100w. how much electrical energy will it consume in 5sec

Answer 1

Answer:

7) (iii) Power = energy / time

energy = 100 × 5 = 500 J

(ii) kinetic energy = 1/2 mv^2

E1 / E2 = m1 / m2 = 1/2

(i) = work done = force × displacement

= 500 × 5

= 2500 J