#### Answer

a) The current through an ideal voltage source is entirely defined by the external circuit.
If a load resistance is involved, the current through the source approaches infinity as the load resistance approaches zero.
b) The voltage across an ideal current source also depends on the circuit it is connected to.
The voltage is directly proportional to the load resistance in the circuit (voltage approaches infinity as the load resistance approaches infinity
)

#### Work Step by Step

An ideal voltage source has an internal resistance of zero and is able to supply any amount of current. This current is defined by the circuit connected to it.
An ideal current source on the other hand has an internal resistance of infinite value. Therefore there is zero voltage when it's connected to a short circuit.