3. which of the following statements is correct?
a. three-way switches are wired internally.
b. three-way switches have two common terminals.
c. four-way switches have the word "on" engraved on their handles
d. four-way switches contain internal wiring.

Acompressor compresses a gas, a pump compresses a liquid. for a given pressure ratio, why does it take more work to compress a gas in a compressor than a liquid in a pump? a)- for a given pressure ratio the average specific volume for a gas is much higher than the average specific volume for a liquid. b)- there is no difference. the only difference is the amount of heat generated (not work) c)- for a given pressure ratio the average volurge for a gas is much higher than the average volume for a liquid. d)-there is no difference