Question

An electric iron has a rating of 750W-220V. Calculate
(i). The current passing through it
(ii) Its resistance, when in use,​

Answer 1

Given : Power = 750 W and Voltage = 220 V

Find : i) The current (I) passing through it

ii) And the resistance (R)

Solution :

i) We know that..

Power = Voltage × Current

We can also, write it like

P = V × I

Put the known values in above formula to find the value of I (current)

=> 750 = 220 × I

=> I = 750/220

=> I = 3.40 A

ii) Now,

We know that..

V = IR

(By ohm's law)

Put the known values in above formula

=> 220 = 3.40 × R

=> R = 220/3.40

=> R = 64.7 ohms

Answer :-

Current is 3.40 A and Resistance is 64.7 ohms.

Answer 2

$\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}$

Actually Welcome to the Concept of the Current Electricity and Power.

Basically here, the Electric power is the Electric work done per unit time,

So we know that,

Power = Voltage * Current

Thus we get as,

750 = 220 * I

I = 750/220 = 3.40 Amperes

thus Current = 3.40 A

Now, According to ohms law, we know that,

V = I*R

so, 220 = 3.40 * R

thus, R = 220 /3.40 = 64.7 ohms

Thus the resistance of the Electric Iron is 64.7 ohms