Question

an electric iron draws 3.4 ampere from 220 volt supply what current will this electric iron draw when connected to 110 volt supply.pls answer me.....​

Answer 1

Explanation:

Ohm's Law, V=IR

Therefore, R=VI

So, R=3.4220=64.7Ω

Now, 

V=110 volt and R=64.7Ω

Hence, I=RV=64.7110=1.69 A

Answer 2

Answer:

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Explanation:

I = 3.4 Amp

V = 220 Volts

Electric iron has a resistance = R

 V = I R

      => R = V / I = 220 / 3.4

               = 64.7  Ω

 

 When the electric iron is connected to a 110 Volts supply,

      I = V / R = 110 / 64.7 = 1.7 Amp.

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Alternately,  As the voltage becomes  half of its value, the current becomes half of its value, as  the current is directly proportional to the potential difference across a conductor or a resistor.    This is as per Ohm's law.