Question

A 40 watt 220 volt lamp and a 100 watt 220 volt lamp are connected in series across a 220 volt line. Which electric lamp glow more bright

Answer 1

Answer:

40W

Explanation:

40W bulb will glow efficiently.

Because, Current in series connection is always same and  

voltage is divided.

here, resistance of 40W bulb is higher than 100W bulb.

so current required to glow a 40W bulb is less than 100W  

bulb(it is quite appeared from ratings).so current flowing  

from the cicuit is according to the eq.resistance of both  

bulb and that would not exceed that current,which can blow  

off 40W bulb and less than current which fully glow the  

100W bulb.remember formula I=V\R.

(note that bulb is purely resistive load)

Answer 2

Explanation:

40 watt

40 watt bulb glows more efficiently because current is series connection is always same and voltage is divided .

off 40 watt bulb and less than the circuit which fully glows the hundred watt bulb

formula

I=V/R