(So far, 4 people got it right out of 12 for a success rate of 33%)

Often, a relais, driven by a transistor, is used to switch heavy loads. The coil of the relais is bypassed by a free-wheeling diode, to protect the switching transistor. So far, so good.

But what is the purpose of the zener diode, sometimes seen in such circuits?

Pick one:
Protects the power supply from spikes.
Protects the coil of the relais.
Reduces turn-off time.
Reduces turn-on time.
None of the above.

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