Number of Resistors needed for a maximum power

[chawki]

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.

 

[gneill]

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.

 

[chawki]

no it's 7 Ohms. sorry for the typing mistake.

 

[SammyS]

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 !