Question

A bulb is rated at 220v 40w what is it resistance

Answer 1

voltage*current = power

220* I =40

I= 0.18

now resistance, R = V/I = 220/0.18=122.2

Answer 2

Given rating details of a electric bulb:

Voltage V = 220 v

Power P = 40 w

Formula to be used:

Power = Voltage * Current

Resistance = Voltage / Current

Current (I) = Power / Voltage = 40 / 220 = 0.18 A

Therefore,

Resistance = V / I

= 220 / 0.18

= 1222 Ohms

Answer:

Resistance of the bulb (R) = 1222 Ohms.

Hope it helps. Thank You!