How Do You Calculate Current in Lamps with Different Wattages?

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SUMMARY

The calculation of current through lamps with different wattages can be accurately performed using the formula I = P/V. For a 60W lamp at 120V, the current is 0.5A, while for a 120W lamp at the same voltage, the current is 1A. This method is confirmed as correct, emphasizing the importance of ensuring that units are consistent during calculations.

PREREQUISITES
  • Understanding of electrical power formulas
  • Basic knowledge of voltage, current, and resistance
  • Familiarity with units of measurement in electrical engineering
  • Ability to perform simple arithmetic calculations
NEXT STEPS
  • Research Ohm's Law and its applications in electrical circuits
  • Learn about the relationship between power, voltage, and current in AC and DC circuits
  • Explore the concept of electrical resistance and its impact on current flow
  • Study the differences between series and parallel circuits and their effects on current
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Students in electrical engineering, hobbyists working with electrical circuits, and anyone interested in understanding the principles of electricity and current calculation.

Elliott.98
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A 60W lamp and a 120W lamp each have a potential difference of 120V across their terminals.

a) What is the current through each lamp?

I think you use the formula I = P/V and so:

Lamp #1 = I = 60/120 and Lamp #2 = I = 120/120

But I don't know if that is right?

Thank you so much for the help!
 
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Elliott.98 said:
But I don't know if that is right?

It's absolutely correct.

( Generally: Remember units. If they don't match, you have made an error ).
 
Hesch said:
It's absolutely correct.

( Generally: Remember units. If they don't match, you have made an error ).

Ok, thank you!
 

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