# Homework Help: Signals and Systems questions

1. Aug 28, 2005

### mathrocks

I have a question about finding the signal energy of a signal? What exactly are you suppose to do when you are given a certain function like
x(t)=rect(t) sin(2*pi*t)?

2. Aug 28, 2005

### Staff: Mentor

To calculate energy, you will need the voltage and current relationships over time, or else the voltage over time and the impedance that the voltage is across. What's the context of the question?

3. Aug 28, 2005

### Antiphon

You would assume that X(t) is a voltage on a resistor and compute the
time integral of $$1/2 x^2(t) /R$$.

4. Aug 30, 2005

### balakrishnan_v

0.5 is the energy

5. Oct 5, 2005

### abdo375

What the Hell are you all talking about ?
to find the signals energy you need to find
the limit when t tends to infinity of the the integration of the square of the given function over it's period