Question

An electric iron draws a current of 4 A when connected to a 200 supply. Find the resistance of the heat element of an electric iron. What current would the iron draw when it is
connected to a 240 V supply?​

Answer 1

Explanation:

••What is Ohm's law an electric iron draws a current of 3.4 A from the 220 V supply line what currents will this electric iron draws when connected to 110 V supply line?

Answer--Thus, the electric iron will draw a current of 1.7 amperes from 110 volt supply line

••What is the resistance of an electric iron which draws a current of 4 A when connected to a 220 V mains?

Answer-∴ Resistance R=IV=4220=55Ω

••What is the heating element of electric iron made of?

Answer-Nichrome

Nichrome is used as a heating element in an electric iron . It is an 80 percent nickel and 20 percent chromium alloy with nickel and chromium. It has a high melting point of 1400 degrees C.

I hope you understand my point

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Answer 2

Given :

• Potential difference, V = 200 V
• Current, I = 0.4 A

To Find :

• Resistance of the heat element of an electric iron, R = ?
• Current of the iron when it is connected to 240 V supply = ?

Solution :

As, we have :

• Potential difference, V = 200 V
• Current, I = 0.4 A

So, to find resistance we have a formula :

$\bull \: \: \: \: \: \underline{ \boxed{ \bf \pink{I = \dfrac{V}{R}}}} \: \: \pink{ \dag}$

By substituting values :

$\sf : \implies 0.4 = \dfrac{200}{R} \\ \sf : \implies R = \dfrac{200}{0.4} \: \: \\ \: \: \: \: \: \: \sf : \implies R = 500 \: ohm$

$\underline{ \tt Hence, \: Resistance = \pink{ \bf 500 \: ohm}}$

Now, if potential difference is changed from 200 V to 240 V, then current will also be changed.

• V' = 240 V
• I' = ?

$\bull \: \: \: \: \: \underline{ \boxed{ \bf \pink{I' = \dfrac{V'}{R}}}} \: \: \pink{ \dag}$

$\sf : \implies I' = \dfrac{240 }{500} \: \: \: \\ \sf : \implies I' = 0.48A$

$\underline{ \tt Hence, \: new \: current = \pink{ \bf 0.48 \: A}}$