They can, but not required.
switches
You need two separate 240 VAC circuits from your electric panel that are each rated at 30 amps if they are electric dryers.
when loads act as switches
An SPST switch can break the connection or hold the connection depending on which switch your using.
To carry elections
It is a way to isolate a circuit from the rest of the circuits in a system. If work or maintenance has to be preformed on a certain piece of equipment a switch is used to de-energise the equipment.
switches
switches
Parallel circuits normally have more than one resistor. Basically parallel circuits are circuits where the current has more than path to follow. However, there are parallel circuits where there are two switches rather than two resistors.
Find the two switches hidden in the trash cans. The two switches are next to each other.
You need two separate 240 VAC circuits from your electric panel that are each rated at 30 amps if they are electric dryers.
when loads act as switches
You are trying to compare apples to oranges. Please rephrase your question.
Colin D. Simpson has written: 'Principles of DC/AC circuits' -- subject(s): Electronic circuits 'Introduction to Electric Circuits and Machines' -- subject(s): Electric circuit analysis, Electric circuits, Electric machinery 'Industrial electronics' -- subject(s): Industrial electronics
Nikola Tesla was the brilliant physicist who developed logic circuits called gates or switches in 1903. Tesla was a Serbian American inventor.
J. Richard Johnson has written: 'Electric circuits' -- subject(s): Electric circuits
Edward Nicholas Pink has written: 'The electric and magnetic circuits' -- subject(s): Electric circuits, Electric currents, Magnetism