Number of Resistors needed for a maximum power

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Homework Help Overview

The discussion revolves around determining the number of resistors, each with a resistance of 70 ohms, that can be connected in a series circuit given a maximum power loss of 1800W and a voltage supply of 127V. There appears to be some confusion regarding the resistance value used in calculations.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants attempt to apply the power formula, P = V² / (x*R), to find the number of resistors. There is a question raised about the correct resistance value, as one participant points out a discrepancy between 7 ohms and 70 ohms in the calculations.

Discussion Status

The discussion is ongoing, with participants clarifying the resistance value and confirming the calculations based on that value. There is no explicit consensus yet, but some participants acknowledge the correction regarding the resistance.

Contextual Notes

There is a noted confusion regarding the resistance value (7 ohms vs. 70 ohms), which could impact the calculations and conclusions drawn from the problem statement.

chawki
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Homework Statement


How many resistors, R = 70 ohms can be connected in a series circuit when the maximum power loss of the circuit is 1800W. and the voltages supply is 127V


Homework Equations


Number of resistors!


The Attempt at a Solution


P = V2 / x*R
x*7=1272/1800
x=1.28

so only one resistor can be connected.
 
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chawki said:

Homework Statement


How many resistors, R = 70 ohms can be connected in a series circuit when the maximum power loss of the circuit is 1800W. and the voltages supply is 127V


Homework Equations


Number of resistors!


The Attempt at a Solution


P = V2 / x*R
x*7=1272/1800
x=1.28

so only one resistor can be connected.

Are the resistors 7 Ω or 70 Ω? Your problem statement says 70, but you've used 7 in your calculation.
 
no it's 7 Ohms. sorry for the typing mistake.
 
chawki said:

Homework Statement


How many resistors, R = 70 ohms can be connected in a series circuit when the maximum power loss of the circuit is 1800W. and the voltages supply is 127V


Homework Equations


Number of resistors!


The Attempt at a Solution


P = V2 / x*R
x*7=1272/1800
x=1.28

so only one resistor can be connected.
If R=7Ω , then this is correct !
 

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