Question

12. Resistance of one among the two soldering iron works in 250 V is 500 12
and that of the other is 750 12.

a) Find out the soldering iron which has more power​

Answer 1

Explanation:

Given,

V = 250 V

Let,

R1 = 500 Ω

R1 = 500 ΩR2 = 750 Ω

P = V I -----> eq 1.

By Ohm's law,

V = I R

I = V / R -----> eq 2.

Substitute eq 2 in eq 1

P = ( V )^2 / R

P1 = ( V )^2 / R1

= ( 250 )^2 / 500

= ( 250 × 250 ) / 500

P1 = 125 W

P2 = ( V )^2 / R2

= ( 250 )^2 / 750

= ( 250 × 250 ) / 750

= 250 / 3

P2 = 83.33 W

P1 > P2

Soldering iron having a resistance of 500 Ω has a power of 125 W, which is greater than the soldering iron having a resistance of 83.33 Ω.

Soldering iron having a resistance of 500 Ω has a power of 125 W, which is greater than the soldering iron having a resistance of 83.33 Ω.Therefore, soldering iron having a resistance of 500 Ω has more power.