- #1
ritwik06
- 580
- 0
Homework Statement
A refrigerator is marked 80W and 250 V. What is likely to happen if the voltage falls to
50V?
Homework Equations
P=V^2/R
V=IR
The Attempt at a Solution
---------------------------------------------------------
R=V^2/P
=250*250/80
=781.25 ohm
Assuming the resistance to be constant.
--------------------------------------------------------
Current earlier=P/V
=80/250
=0.32 A
----------------------------------------------------
Current when voltage falls to 50V
=50/781.25 (V=IR)
=0.064 A
---------------------------------------------------
Power will also decrease.
P=VI
=50*0.064
=3.2 W
******************************************
It seems that the appliance will be damaged. I have no idea about anything further. Am I right? I have written everything i could make out. Please help me now.