A zener diode is normally used for voltage regulation. A zener diode, however, can also be used for high-voltage spike protection if connected ________.

In the context of using a zener diode for high-voltage spike protection, it is crucial to understand how zener diodes operate in reverse bias. When a zener diode is reverse-biased, it can maintain a constant voltage across it as long as the applied reverse voltage does not exceed its rated zener voltage. This characteristic makes it effective in clamping high voltage spikes to protect sensitive components in a circuit.

Connecting the zener diode with the positive terminal to the cathode and ground to the anode means that the diode is reverse-biased. Under normal operating conditions, the diode will not conduct. However, when a voltage spike occurs that exceeds the zener breakdown voltage, the diode will conduct, effectively shunting the excess voltage to ground and preventing damage to downstream circuitry.

This arrangement is specifically designed to safeguard electrical components from sudden voltage increases while maintaining the operational voltage levels of the circuit. Hence, connecting the zener diode in this manner allows it to function optimally for spike protection.