# Power or Energy Signal of $x(t) = t \cdot u(t)$ [closed]

Is $x(t)=t \cdot u(t)$ a power signal or an energy signal? Please "show" me why - preferably using equations.

## closed as unclear what you're asking by lennon310, Peter K.♦Feb 6 '18 at 13:40

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• This question would do so much better with you showing your attempt. Your question is very basic, and it's really hard to see what you're missing to answer this. – Marcus Müller Feb 1 '18 at 7:18
• Sounds like a “Please do my homework for me” request especially if the homework required the student to show the work and will not accept succinct answers such as “Power”, “Energy” or “Neither” or “Both” – Dilip Sarwate Feb 1 '18 at 15:29

$$E_\infty = \int\limits_{-\infty}^{\infty} |x(t)|^2 dt$$
$$P_\infty = \lim\limits_{T\to\infty} \frac{1}{2T}\int\limits_{-T}^{T} |x(t)|^2 dt$$
If your signal has finite power ($0<P<\infty$) then it's a power signal. If the signal has finite energy then it's an energy signal (Notice that a signal can be neither type but can't be an energy and a power signal at the same time).