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An electric iron draws a current of 3.4A...

An electric iron draws a current of 3.4A from the 220V supply line. What current will this electric iron draw when connected to 110 V supply line?

A

1.7A

B

1.8A

C

1.9A

D

2.0A

Text Solution

Verified by Experts

The correct Answer is:
A
First of all we will calculate the resistance of electric iron. Now, in the first case, the electric iron draws a current of 3.4A from 220V supply line. So,
Potential difference, `V = 220V`
Current, `I = 3.4A`
And, Resistance, `R = ?` (To be calculated)
Now, `(V)/(I) = R`
So, `(220)/(3.4) = R`
Resistance, `R = 64.7 Omega`
Thus, the resistance of electric iron is 64.7 ohms. This resistance will now be used to find out the current drawn when the electric iron is connected to 110V supply line. So,
`(V)/(I) = R`
`(110)/(I) = 64.7`
Current, `I = (110)/(64.7)`
`=1.7A`
Thus, the electric iron will draw a current of 1.7 amperes from 110 volt supply line.
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