- #1

melissa_y

- 17

- 0

I have no idea where to even begin except that I should find the intial current which is found by equation P=I^2R

Please help me!

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- Thread starter melissa_y
- Start date

- #1

melissa_y

- 17

- 0

I have no idea where to even begin except that I should find the intial current which is found by equation P=I^2R

Please help me!

- #2

mathmike

- 208

- 0

you can also use the fact of p = I^2R = V^2 / R

- #3

BobG

Science Advisor

Homework Helper

- 330

- 84

So, if the power is equal to [tex]P=RI^2[/tex], then it's also equal to [tex]P=VI[/tex]

The current being delivered to the circuit comes from the Power and Voltage relationsip.

To find how much power is lost, you have a new problem that uses the result of the first (you had to solve for I). You use the [tex]P=RI^2[/tex] to find out how much power is dissipated by the wire.

Change the value of the voltage and repeat. Compare the two results.

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