In a summing-amplifier mixer, the channels do not interact because each input feeds:

The virtual earth, held near 0 V

A loudspeaker must be driven by a power amplifier rather than a voltage amplifier because the speaker needs:

A large current to deliver power

Ripple, by charging on peaks and discharging between them

Come twice as often with no gaps

Hold the output voltage constant despite load and input changes

Melting and breaking the circuit if the current is too high

A fault current flows to earth and blows the fuse

12questions. Pick an answer and you'll see why right away.

An audio mixer is usually built from which op-amp circuit?
In a summing-amplifier mixer, the channels do not interact because each input feeds:
A voltage gain of 100 expressed in decibels is:
A loudspeaker must be driven by a power amplifier rather than a voltage amplifier because the speaker needs:
Tone controls in an audio system are made from:
The first stage of a mains DC power supply is the:
A full-wave bridge rectifier uses how many diodes?
The reservoir (smoothing) capacitor in a power supply reduces the:
A full-wave rectified output is easier to smooth than a half-wave output because its pulses:
The job of a voltage regulator in a power supply is to:
In mains equipment, a fuse protects the circuit by:
Earthing the metal case of an appliance makes a fault safe because: