# Homework Help: Current and Power

1. May 15, 2007

### tdk

1. The problem statement, all variables and given/known data
the current through the toaster connected to a 120-V source is 8 A. What power is dissipated by the toaster?

2. Relevant equations

I=V/R

3. The attempt at a solution

v=120
A=8
I=(120)?

2. May 15, 2007

### Staff: Mentor

The relevant equation that you need is the Power in terms of the Current and Voltage. Are you familiar with that equation?

3. May 15, 2007

### chroot

Staff Emeritus
You can't use I = V/R, because that equation does not contain any reference to power!

If you assume P = V * I, then P = V^2 / R.

- Warren

4. May 17, 2007

### tdk

is the equation i have to use p=I/V?

5. May 17, 2007

### chroot

Staff Emeritus
That equation is not correct. I gave you the equation in my previous post, did you read it?

- Warren

6. May 17, 2007

### tdk

yes i read your post, you said P = V^2 / R. But I dont know what R is

7. May 17, 2007

### chroot

Staff Emeritus
So, you didn't read my post in entirety. I said specifically that

P = V * I

- Warren

8. May 17, 2007

### tdk

Ohh yeah, I'm sorry thats what I meant to say in my previous post. I understand now,Thanks for your help!