# Partial derivative

1. Oct 6, 2008

### lemaire

1. The problem statement, all variables and given/known data

I have an initial data of d= 0.012608, V = 320 volt, Q = 1.50e-8 and A = 1.25e-4. y = Qd/AV. what is Δy , the partial derivative of y with respect to d?

2. Relevant equations

3. The attempt at a solution

2. Oct 6, 2008

### gabbagabbahey

When you take the partial derivative with respect to a variable, you treat all other variables as constants, so what is

$$\frac{\partial}{\partial d} \left( \frac{Q}{AV} d \right)$$

when you treat $\frac{Q}{AV}$ as a constant?