Final answer:
An ideal amplifier should have zero differential voltage at its input terminals, zero current into the input terminals, and zero output resistance. However, it's not correct to say that an ideal amplifier has zero output current or zero input resistance; an ideal amplifier is actually designed to deliver output current and has infinite input resistance.
Step-by-step explanation:
For an ideal amplifier, some characteristics do not hold true. Let's evaluate each of the given statements:
- a. The differential voltage between the input terminals is zero. - This is a characteristic of an ideal operational amplifier (op-amp), ensuring the same voltage at both inputs due to infinite gain.
- b. The current into to input terminals is zero. - Ideal amplifiers have infinite input impedance, which means no current flows into the input terminals.
- c. The current from the output terminal is zero. - This statement is not true as the purpose of an amplifier is to provide power amplification, hence current must flow from the output.
- d. The input resistance is zero. - This statement is not true; an ideal amplifier actually has infinite input resistance.
- e. The output resistance is zero. - This is a characteristic of an ideal amplifier, this ensures maximum power transfer to the load by behaving as an ideal voltage source.
So, the statements that are not true for an ideal amplifier are c and d.