Question

An electric iron draws a current of 2 A from the 220 V supply line. What current this electric

iron draws when connected to 110 V supply line?

a) 0.5 A b) 2 A c) 4 A d) 1 A​

Answer 1

Answer:

Given -

• l = 2 A
• V = 220 Volts.

Electric iron has a resistance = R

V = l R

→ R = V/I

→ R = 220 / 2

→ 110 Ω.

• R = 110 Ω

When the electric iron is connected to 110 V supply line -

l = V/R

→ l = 110/110

→ 1 Amp.

Therefore, right option is d) 1 A.

Answer 2

☢ Given :-

• Voltage = 220 Volts.

• Current = 2 A.

☢ To Find :-

• Current when voltage is 110 Volts.

☢ Solution :-

We know the Formula :-

V = IR

V = Voltage, I = Current, R = Resistance.

Put the values.

R = V / I

R = 220 / 2

R = 110 Ω

But, When Iron is connected to 110 Volts Supply pipes :-

I = V / R

I = 110 / 110

I = 1

So, Your Answer :- 1 Ampere = Option (D).