Question

Ceiling-mounted fluorescent lighting fixtures with total power equal to 400 W are used to produce an average illumination level of 600 lux on student desks in a particular classroom. If the classroom lights are on 10 hours a day for 200 days per year, calculate the annual energy used for lighting in this classroom.
A 800 kWh
B 2 kWh
C 2,000 Wh
D 2,000 kWh
E 800,000 kWh
F 600 kWh

Answer 1

Answer:

$E = 800\,kWh$

Explanation:

The annual energy used for lighting in the classroom is:

$E = (0.4\,kW)\cdot \left(10\,\frac{h}{day} \right)\cdot \left(200\,\frac{day}{year} \right) \cdot \left(1\,\frac{kWh}{year} \right)$

$E = 800\,kWh$