Connect the telegraph key, the buzzer and the dry cell in series and then shunt them around the grid condenser.
The dry cell will give a strong current, but for a short time only.
A dry cell is composed of two elements, usually zinc and carbon, and a liquid electrolyte.
With the armature still off, connect the field coil directly to the dry cell.
Plainly visible on its shaft is a commutator to which the electric current from a dry cell is sent.
Use a short strand of iron picture wire and hook the ends to the terminals of a dry cell battery.
Do you know what difference the size of dry cell battery makes in the voltage it supplies?
Now, why don't I feel the electricity when I touch the binding posts of this dry cell?
The key should be used in case a dry cell acts as the source of the current.
I fastened one end of this wire to one of the binding posts of a dry cell (Fig. 113), a, and attached branches c and d to it.
|dry cell |
A galvanic electric cell, such as a flashlight battery, in which the chemicals in the electrolyte are made into a paste so that they cannot easily spill from their container. Compare wet cell.