railway RRB JE (CBT I + CBT II) Mock Test 2024 Utilization of Electrical Energy Illumination

The term 'lamp efficiency' is defined as _______.

1
total emitted light flux – total lamp power input
2
total lamp power input / total emitted flame flux
3
total emitted light flux / total lamp power input
4
total emitted light flux + total lamp power input
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