Generally, limit switches are used as ____________________ devices that control the coil of relays and motor starters in control circuits.

When two dissimilar metals are joined at one end, and that junction is heated, a voltage is produced. This is known as the ____________________.

Figure 12-4 In the circuit shown in the accompanying figure, timer coil TR1 is connected in ____________________ with the 1M starter coil.

A(n) ____________________ is a device used to generate alternating current at a desired frequency.

Figure 12-4 In the circuit shown in the accompanying figure, timer coil TR1 is connected in ____________________ with the 1M starter coil.

A contactor is a relay that contains ____________________ contacts.

Regardless of the type of photoemissive device used, or the type circuit it is used in, the greatest advantage of the photoemissive device is ____________________.

Figure 22-1 In the accompanying figure, two float switches are necessary in this circuit because the tank is to be ____________________.

Which two taxonomic groups are in the correct sequence to be between Class and Genus?  (T 2)

____________________ are designed to produce an output voltage that is proportional to the strength of a magnetic field.