  In small systems where relevant energies are comparable to thermal agitation,
fluctuations are of the order of average values. In systems in thermodynamical
equilibrium, the variance of these fluctuations can be related to the
dissipation constant in the system, exploiting the Fluctuation-Dissipation
Theorem (FDT). In non-equilibrium steady systems, Fluctuations Theorems (FT)
additionally describe symmetry properties of the probability density functions
(PDFs) of the fluctuations of injected and dissipated energies. We
experimentally probe a model system: an electrical dipole driven out of
equilibrium by a small constant current $I$, and show that FT are
experimentally accessible and valid. Furthermore, we stress that FT can be used
to measure the dissipated power $\bar{\cal P}=RI^2$ in the system by just
studying the PDFs symmetries.
