When both inputs are zero an op amp ideally should have an output?

Since, the difference in input voltage on both inputs is zero. Therefore, output of an ideal op-amp is also zero.

Why the voltage across the input terminals of an ideal op amp is zero?

The implication of zero voltage between the input leads means that, if one input is tied to a hard voltage source such as ground, then the other input is at the same potential. The current flow into the input leads is zero, so the input impedance of the op amp is infinite.

Why the input current in ideal op amp is zero?

The ideal op amp has zero input current. This is because of infinite input resistance. As the input resistance of ideal op amp is infinite, an open circuit exists at input, hence current at both input terminals is zero.

When both the inputs of open loop op-amp are grounded the voltage across the output is called?

output offset voltage
1) Op-amp is a direct-coupled device with large DC gain. 2) The output of op-amp will not be zero even if both inputs are grounded. This is called output offset voltage or Error voltage.

When same voltage is applied to both the inputs of an op amp the output voltage is infinite?

An operational amplifier only responds to the difference between the voltages on its two input terminals, known commonly as the “Differential Input Voltage” and not to their common potential. Then if the same voltage potential is applied to both terminals the resultant output will be zero.

What makes an op-amp a good voltage source?

With an A=200,000V/V saturation occurs with an input differential voltage of 10/200,000 = 50µV, a very small voltage. From a practical point of view, an ideal op-amp is a device which acts as an ideal voltage controlled voltage source. In addition the ideal op-amp model will have infinite open loop gain ( A → ∞).

Can current flow into the output of an op-amp?

Long before the op amp was invented, Kirchoff’s law stated that the current flowing into any node of an electrical circuit is equal to the current flowing out of it. The same cannot be said for the output, since the op amp can source or sink current.