Question

An electric iron is rated 1100W, 220V. Calculate: (i) resistance of the iron (ii) current it draws

Answer 1

Answer:

(i) 44 ohms

(ii) 5 Amperes

Explanation:

Given :

• Power rating = P = 1100 watts

• Potential difference = v = 220 volts

To find :

• Resistance of the iron

• Current drawn by the electric iron

P=v²/R

Substituting the values :

1100=220²/R

1100R = 48,400

R=48,400/1100

R=44 ohms

The resistance of the electric iron is equal to 44 ohms

Now using the ohms law:

V=I×R

220=I×44

I=220/44

I=5 Amperes

The current drawn by it is equal to 5 Amperes

Answer 2

Given:

• Electric iron is rated 1100W , 220V

To find:

• Resistance
• Current

Solution:

Using

P = v²/R

1100 = 220²/R

R = 220²/1100

R = 44ohm

Now , finding current

V = I × R

220 = I × 44

I = 220/44

I = 5 A

Answers

Resistance = 44 ohm

Current = 5A