engineering recuitment PGCIL Junior Technician Trainee (Electrician) Mock Test 2023 Utilization of Electrical Energy Illumination
If dΦ is the luminous flux incident normally on an area dA, then Illuminance is given as:
1
dΦ - dA
2
Φ × A
3
\(\frac{{dA}}{{d{\rm{\Phi }}}}\)
4
\(\frac{{d{\rm{\Phi }}}}{{dA}}\)