(a) A voltage source produces a voltage V when its terminals are disconnected (open circuit).

2. (a) A voltage source produces a voltage V when its terminals are disconnected (open circuit). When a device that draws a current I is connected across its terminals, the voltage decreases to V V . What is the internal resistance? (b) A current source produces a current of I when a wire connects the terminals. When a device is instead connected to the terminals the current drops to I I and the voltage across the terminals is V . What is the internal resistance?