Question

3) A cell is connected to a 9 resistance, beacuse of which heat of 400 J is produced
per second due to current flowing through it. What is the potential difference applied
across the resistance?
a) 40V b) 60v C) 80 V d) 50v
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Answer 1

Answer:

Correct answer is 60V

Explanation:

In the pic.... Hope it helps

Answer 2

Answer:60 V

Explanation: We know that:

Energy Consumed (Heat)= Power * time

=> 400J = power * 1s

=> power = 400watt

Now, R= 9 ohm

We know that, Power = V^2/R

=>V^2= power*R

= 400*9

= 3600

=> V=√3600

=> V = 60Volt

Hope this helps you!