Question

2. The potential difference between the terminals of an electric toaster is 40V when it draws a
current of 4A from the source. What current will the toaster draw if the potential difference is
increased to 120V?
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Answer 1

Answer:

Given :

Potential Difference of heater = 60v

current I=4A

Resistance =R?

By Ohm's law :

V=IR

R=V/R

=60/4=15 ohms

Now if potential is increased to 120 V

I=?

V=IXR

I=V/R

=120/15

=8 A

Hence current drawn by heater is 8A

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Explanation:

Answer 2

Answer:

by ohms law,

V=IR

By firstly,

V=40V,. I=4A,. R=??

so,

40=4×R

10 ohms=R. (1)

by secondly,

V=120V,. I=xA,. R=????

so,

120=x × R

120/x=R. (2)

from 1&2

we get,

both resistance are equal

so,

(1)=(2)

10=120/x

x=120/10

x=12A

answer=12A

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