Effects of Voltage Drop on a Refrigerator Rated 80W & 250V

In summary, if the voltage falls from 250V to 50V, the resistance of the appliance remains constant at 781.25 ohm and the current decreases from 0.32A to 0.064A. This results in a decrease in power from 80W to 3.2W, which could potentially damage the appliance if it cannot handle the stall current.
  • #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.
 
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  • #2
Your reasoning looks entirely correct to me. Of course, in the real world, you're probably right -- the appliance may well be damaged if its compressor can't turn and it just sits there soaking up stall current until it overheats.

- Warren
 
  • #3


I would like to clarify that the effects of voltage drop on a refrigerator rated 80W and 250V will depend on the type of refrigerator and its specific design. It is important to note that voltage drop can occur due to various factors such as long wiring, poor connections, and high demand on the electrical grid. In this scenario, assuming the refrigerator is designed to operate at 250V, a decrease in voltage to 50V will result in a decrease in power consumption as calculated in the attempt at a solution. This means that the refrigerator will not operate at its full capacity and may take longer to cool or maintain its temperature.

However, it is unlikely that the appliance will be damaged as most modern refrigerators have built-in protection mechanisms to prevent damage from voltage fluctuations. These mechanisms can include voltage stabilizers or surge protectors. In addition, the refrigerator's internal components such as the compressor and fan motor are designed to operate within a certain voltage range to ensure their longevity.

In summary, a voltage drop to 50V may affect the performance of the refrigerator, but it is unlikely to cause any significant damage. It is important to address the root cause of the voltage drop to ensure the safe and efficient operation of the appliance.
 

1. What is voltage drop?

Voltage drop is the decrease in electrical potential that occurs when an electrical current flows through a resistance. It is measured in volts and can affect the performance of electrical devices.

2. How does voltage drop affect a refrigerator rated 80W and 250V?

A voltage drop in a refrigerator rated 80W and 250V can cause a decrease in the power supply, leading to a decrease in the efficiency and performance of the refrigerator. This can result in longer cooling times and potential damage to the refrigerator's components.

3. What are the potential consequences of voltage drop on a refrigerator?

The consequences of voltage drop on a refrigerator can include increased energy consumption, decreased cooling capacity, and potential damage to the refrigerator's electrical components. In extreme cases, voltage drop can even lead to a complete breakdown of the refrigerator.

4. How can voltage drop be prevented in a refrigerator?

To prevent voltage drop in a refrigerator, it is important to ensure that the electrical wiring and connections are in good condition and the correct gauge for the voltage and wattage of the appliance. Regular maintenance and cleaning can also help to prevent voltage drop.

5. Can voltage drop be fixed once it has already occurred in a refrigerator?

Depending on the extent of the voltage drop, it may be possible to fix it by replacing damaged wiring or components. However, in some cases, the effects of voltage drop may be irreversible and the only solution may be to replace the refrigerator. It is important to regularly check for and address any signs of voltage drop to prevent further damage.

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