Question

You are given a 400V, 1600W device. What is it's power at 100V

Answer 1

Answer:probably 400W

Explanation:

Answer 2

Given that :- A device having $400 V, 1600 W$ratings,

As we have to find the power at $100 V$

So, the resistance of the device,

⇒ $R=\frac{V^{2} }{P}$

⇒ $R=\frac{400^{2} }{1600}$

⇒ $R=\frac{160000}{1600}$

⇒ $R=100$ Ω

Now, for power at 100 V,

⇒ $P=\frac{V^{2} }{R}$

⇒ $P=\frac{100^{2} }{100}$

⇒ $P=100 W$