Question

an electric iron is marked 100w 220v what is the current drawn by iron and what is resistence of the iron

Answer 1

Power = 100W
Potential Difference= 220V

Formula used P = VI
Current = P/V = 100/220A or 0.45A

Formula used P = I^2R
Resistance = P/(I^2)
= 100*220*220 /100*100
= 484Ω

Answer 2

Hey there !!

Power = P = 100 W 

Voltage = V = 220v

Current = I

P = I × V
100 = I × 220

I = 100/220 = 0.45 A

Current drawn by iron  = 0.45 A      

--------------------------------------------

Resistance = R

P = I² × R

100 = (0.45)² × R

100 = 0.2025 × R

R = 100 / 0.2025
    = 493.82Ω

Resistance = 49.82 Ω