Question

connect 3 led light bulbs or torch bulbs in series and parallel with a 9 volt battery, compare the brightness of bulbs in each case . give reson for your observation​

Answer 1

Answer:

In parrel bulb glow bright

Explanation:

As torch bulb britness based on heating effectt

Means bithness= heating power = volt*current

We assume that all 3 torch light have same resistance assume 1ohm

so current in parallel devide equally

And voltage in series devide equally

In parallel

All have same voltage of 9 volt

And current devided equll

I1 =i2. =i3. =3amp

P= v*i= 9*3 =27watt

In series

Current flow same in all

And voltage devide equally

V1.= V2=. V3=. 3volt

I=(V/R)

Total voltage across three is 9volt

Total resistance is 3 ohms ( we assumed resistance 1ohms and in series they add)

Total current = (9/3) =3amp

Power=3*3 =9

So in parrel bulb glow bright

Hope you get your ans