Define the unit of electric current.

Judge the equivalent resistance when the following are connected in parallel: $1 \, \Omega$,$10^3 \, \Omega$,and $10^6 \, \Omega$.

Several electric bulbs designed to be used on a $220\, V$ electric supply line,are rated $10\, W$. How many lamps can be connected in parallel with each other across the two wires of a $220\, V$ line if the maximum allowable current is $5\, A$?

Calculate the number of electrons constituting one coulomb of charge.

An electric motor takes $5\, A$ from a $220\, V$ line. Determine the power of the motor and the energy consumed in $2\, h$.

Judge the equivalent resistance when the following are connected in parallel: $1\, \Omega$ and $10^6\, \Omega$.