a bulb of 100W and anather bulb of 200W , rated supply
voltage 230v.when supply voltage is reduced to 100v,which
bulb will give more light? and why with calculation?




Answer Posted / nimish

P = V*i

For 100w bulb i = 100/230 = 0.4 A

For 200w bulb i = 200/230 = 0.8 A

Now voltage is reduced to 100 V , i = 100 / 100 = 1 A

i = 200 / 100 = 2 A

So, 200 W bulb will give more light.

Is This Answer Correct ?    63 Yes 10 No






Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

what is the meaning of impedance protected in instrument cooling fan

1439


we have 3 single phase transformers. how will we generate 6 supply from 3 phase supply input

907


what is lumped and distributed elements?

725


What are your personal skills and abilities for such a Master Course and your possible preparation to undertake this course?

805


Saving in copper achieved by converting a 2 winding transformer in to an auto transformer is determined by A voltage transformation ratio B load on secondary C quality of core material D size of transformer core

1168






what is the purpose of silicon dropper used in battery charger?

3718


can i able to get bhel previous exam question paper?

894


how to calculate vfd o/p voltage by frequency

923


why constant voltage transformer should be start without load? and if started then what will happen?

812


What is Harmonics how it is produced and what is the method to control the same

1016


What is the working principle of MIG welding? and its out put Voltage?

1960


WHat is the general checks required for Dry type transformers

816


Explain Continuous and Discrete signals?

471


lorteny method

755


how ups works ? various parts of ups and working principle

691