Question

The potential differenence between the terminal of electric heater is 60V . when it draws a current of 4A from the source . what is the current will the heater draws , if the potential differenence across the resistors.
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Answer 1

Answer:

8 amphere

Explanation:

V=60

I= 4 A

R =V/I

=60/4

15 ohm

V = 120v

R= 15 ohm

=120/15

=8 amphere

Answer 2

Answer:

The current through the heater becomes 8 A.

Explanation:

Given,

The potential difference between the terminals of an electric heater is 60 V.

Current of 4 A is drawn from the source.

To find: What current will the heater draw if the potential difference is increased to 120 V

Solution:

According to Ohm's law, Potential difference is directly proportional to current.

i.e V  $\propto$  I

or, V = iR

here, V = 60 V and i = 4 A

Substituting the values,

R = V / i = 60 / 4 = 15 Ω

Now, V is increased to 120 V.

Again using ohm's law,

i = V / R = 120 / 15 =  8 A

Therefore, The current through the heater becomes 8 A.