Horns - 6 to 12 volt

[Flat Ernie]

Originally Posted by rotorwrench

I agree that the first vibrator coil making and breaking the circuit interferes with the current to the next & vice versa but there is a little more going on there in a series circuit. The statement is not totally inaccurate. There is more than one reason why one is louder than the other.

Whether you put the ammeter at the positive terminal, between the horns, or negative terminal, it will read the same - total current through the circuit will be the same regardless of where you measure it so long as the horns are wired in series.

The problem is, just as the second horn is getting its voltage, the first horn is opening its contacts, so it may not get enough TIME at full current to create a strong enough magnetic field to fully pull the contacts open. This is why it sounds weaker.

The voltage drop across the horns may be different if they have a different impedance/resistance in the coil, but the total current will be the same regardless of where you measure it.