# power equation

#### 0001T

Joined Feb 28, 2007
15
Hi,

I am doing a project to measure power required to heat up a wire. I will be measuring the resistance and voltage across the wire against time. Therefore I will have:

resistance of wire = R(t)
voltage across wire = V(t)

I know power =V*R

So am I correct to do integrate V(t)*R(t) from t=0 to t=t1?

Thank you.

#### arthur92710

Joined Jun 25, 2007
307
Hi,

I am doing a project to measure power required to heat up a wire. I will be measuring the resistance and voltage across the wire against time. Therefore I will have:

resistance of wire = R(t)
voltage across wire = V(t)

I know power =V*R

So am I correct to do integrate V(t)*R(t) from t=0 to t=t1?

Thank you.
Im not sure about the rest but "I know power =V*R" is wrong
Power = I*V Current times voltage

#### 0001T

Joined Feb 28, 2007
15
Im not sure about the rest but "I know power =V*R" is wrong
Power = I*V Current times voltage
thanks for the correction. u r right.

so now my equation will be to integrate V(t)*V(t)/R(t) from t-0 to t-t1.

#### hgmjr

Joined Jan 28, 2005
9,027
I believe you will find that power is actually V squared divided by R.

hgmjr