(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The voltage(V) volts in a circuit at time(t) is given by

V(t)=18(1 - e -4t/9)

Find the expression for dV/dt.

Hence evaluate dV/dt at

(a)t=0 and (b)t=5 seconds

2. Relevant equations

Just wondering if this is right and if not where did i go wrong

3. The attempt at a solution

dV/dt=18(-4/9)(1-e-4/9t)

= -9(1-e-4/9t)

(a) t=0 -8(1-e-4/9(0))

=0mA

(b)t=5 -8(1-e-4/9(5))

=-7.13mA

**Physics Forums | Science Articles, Homework Help, Discussion**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: The voltage(V) volts in a circuit

**Physics Forums | Science Articles, Homework Help, Discussion**