Shock from a relay?

[Reggiewolf]

How would I wire up this relay to give an electric shock?

 

[Russlk]

The relay coil has inductance. When a voltage is applied to the coil, current starts to flow. The current causes a magnetic field to expand around the coil, but as the field expands, it generates a voltage in the coil that opposes the current. As a result, the current increases slowly (well, slowly is several milliseconds). When you break the circuit and stop the current, the field colapses very rapidly producing a high voltage, high enough to give a shock.

 

[Reggiewolf]

So how would I wire this to do that?

 

[Russlk]

Here is the circuit.

 

[Oznog]

Better yet, you'd hook up the relay so when the coil energizes it breaks the contacts that deliver power to the coil, so it'll buzz all on its own and generate lots of nasty HV spikes.