Question

A power source provides a load of 0.4 A and 20 w at 220 V to the internal resistance of the source?
1. 40 ohm
2. 20 ohm
3. 45 ohm
4. 50 ohm​

Answer 1

Answer:

Given, V= 220V

I= 0.4 A

P= 20 W

R= ?

We know, V= IR

R= V/I

R= 220/0.4

R= 5.5 ohm