# An electric iron draws a currunt of 3.4 amphere from the 220 volt supply line.what currunt will this electric iron draws when connected to 110 volt supply line.

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by marina1

2015-04-19T11:41:57+05:30

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Say the current is when connected to supply, setup a proportion using ohm's law and solve

2015-04-22T14:49:40+05:30

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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.

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