Question

The potential difference between the terminals of an electric heater
is 60 V when it draws a current of 4 A from the source. What
current will the heater draw if the potential difference is increased
to 120 V?​

Answer 1

Answer:

Explanation:

Solution,

Here, We have

Potential difference = 60 V

Current drawn = 4 A

To Find,

Current drawn by heater if the potential difference is increased  to 120 V.

At, we will find out resistance,

According to the Ohm's law,

We know that

V = IR

R = V/R

So, putting all the values, we get

⇒ R = V/R

⇒ R = 60/4

⇒ R = 15 Ω

Here, the resistance is 15 Ω.

Now, we will find out current drawn,

We know that

V = IR

I = V/R

So, putting all the values again, we get

⇒ I = V/R

⇒ I = 120/15

⇒ I = 8 A

Hence, the current drawn if the potential difference is increased to 120 V is 8 A.

Answer 2

Answer:

8 amperes

Explanation:

Given :

• Potential difference between the terminals of the electric heater = 60 Volts

• Current drawn by the electric heater = 4 Amperes

• Potential difference is increased to 120 Volts

To find :

• Current passing through the electric heater if potential difference is increased to 120 volts

Using the ohms law :

V=I×R

60=4×R

R=60/4

R=15 ohms

The resistance will remain constant and it is given that potential difference is increased to 120 volts

Using the ohms law:

120=I×15

I=120/15

I=8 amperes

The current drawn now will be equal to 8 amperes