Question

a bulb rated 36w and 12 volt are connected across 20 volt .what resistance is required to glow it with fullintensityb ? a)1.2 b)2.7 c)5.8d) 7​

Answer 1

Power (P) = Energy used (E) / time period (t)

P=E/t

We know that

E= Force(F) * Displacement(s)

So, P= F*s/t

We know that

Velocity(v) = displacement (s)/time(t)

Using this

→ P=Fv

→ P= 4500N * 2m/s

P= 9000Watts = 9KW