A/An ... is an occurrence when a serious or unexpected dangerous situation occurs that requires immediate attention - NSC Electrical Technology Electronics - Question 1 - 2022 - Paper 1

When decreasing frequency to below resonance in a series RLC resonance circuit, the impedance decreases and the circuit becomes capacitive, leading to voltage drop changes in the inductor and capacitor.

The opposition to AC current flow caused by a capacitor will increase when the frequency is decreased. As frequency decreases, the reactance of the capacitor increases.

If the emitter of the UJT is supplied with sufficient current, its operating point will continue falling until the pinch-off voltage is reached.

A Darlington transistor amplifier develops a very low output impedance when used as common emitter.

An op-amp circuit without any feedback has open-loop gain, which can be significantly high.

The pin that sets the voltage at which the 555 will trigger is known as the threshold.

A monostable multivibrator is used to eliminate switch bounce in electronics circuits by generating a single pulse in response to a trigger.

A circuit used in an audio mixer to individually amplify or attenuate each input signal is the summing amplifier.

A basic op-amp comparator circuit uses negative feedback, allowing it to compare two voltages and output a high or low signal based on the comparison.

A differentiator produces an output which is directly proportional to the rate of change of the input signal, making it sensitive to rapid changes.