Question

(b)one electronic bulb is rate 40w and 240v and other 25w and 240v. Which bulb has higher resistance and how many time ?

Answer 1

Answer:

2nd bulb has the higher resistance

Explanation:

As the formula for power is

$p = \frac{ {v}^{2} }{r}$

where v and r are potential difference and resistance respectively.

so according to the formula

$r1 = \frac{ {(v1)}^{2} }{p1} \: and \: r2 = \frac{ {(v2)}^{2} }{p2}$

by putti g the values

R1 = 1440 ohm

R2 = 2304 ohm