Power Limit on Mains: Why Does This Happen?

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SUMMARY

The discussion centers on the phenomenon of voltage drop in electrical circuits, particularly when high-wattage appliances are used alongside lower-wattage devices like lightbulbs. When a high-wattage appliance is activated, it draws significant current, leading to a reduction in voltage available to other devices on the same circuit. This effect is attributed to the resistance in the conductors, as explained by Ohm's Law, which states that voltage drop occurs due to the resistance encountered by the current flow.

PREREQUISITES
  • Understanding of Ohm's Law
  • Basic knowledge of electrical circuits
  • Familiarity with voltage and current concepts
  • Awareness of electrical resistance in conductors
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  • Research the impact of wire gauge on voltage drop in electrical circuits
  • Learn about power ratings and their implications for circuit design
  • Explore methods to mitigate voltage drop in residential wiring
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USEFUL FOR

Electrical engineers, electricians, and anyone interested in understanding voltage behavior in residential and commercial electrical systems.

Sakha
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Hi.
Sometimes it happens that if you have a lightbulb and something else that is rated high wattage in the same mains outlet (sometimes even on different outlets), and turn the high-wattage appliance, you can see how the lightbulb gets dimmer.
Why does this happens?

Thanks.
 
Engineering news on Phys.org
It happens because of voltage drop in the wires/connections. Since no conductor is perfect some voltage is lost when high(er) currents are being carried by said conductors due to their resistance. Ohms law and all...
 

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