PLZ ANS TODAY PRE BOARD TMRW.........

dEAR STUDENT,

500w BULB IN PARALLEL WILL GLOW BRIGHTER.

It two bulbs are in series then you have to go through both of them to get from one terminal of the battery to the other.  In other words there is only one conducting path.

If two bulbs are in series then there are two problems

1. Both bulbs are dimmer than they would be by themselves
2. You can't turn one bulb off without turning both off

Brightness depends on power.  Power depends on both voltage and current.  With two bulbs in series you halve the voltage and roughly half the current so the power dissipated in each bulb, and hence the brightness, is roughly a quarter what it would be if the bulb was connected alone.

In parallel circuits low resistance bulbs are brighter because they have a bigger current through them for the same p.d.

Hope this helps.

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