Level:
Project ID:
2010013706
Source Problem:
Accepted:
0
Clonable:
1
Easy:
0
An electrical source is characterized by the electromotive force \(U_e=40\,\mathrm{V}\)
and the internal resistance \(R_i=2\,\Omega\). Determine the value of the electric current
for which the appliance power will be at its maximum and determine the value of this maximum power as well.
\[\]
Hint: The dependence of the power of an appliance (\(P\), unit Watt (\(\mathrm{W}\)))
on the magnitude of the folowing current (\(I\), unit Ampere (\(\mathrm{A}\))) is given by the relation
\(P=U_eI-R_iI^2\). The source properties have a role of parameters: \(U_e\) is the electromotive
force and \(R_i\) is the internal resistance of the source.
\(10\,\mathrm{A},\ 200\,\mathrm{W}\)
\(10\,\mathrm{A},\ 380\,\mathrm{W}\)
\(20\,\mathrm{A},\ 760\,\mathrm{W}\)
\(4\,\mathrm{A},\ 128\,\mathrm{W}\)