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moves away from the switch and this allows the
spring to pull the switch back.
This opens the circuit. The open circuit prevents the
current from flowing. When
this happens, the
buzzer makes a sound.
But how does the buzzer sound when there is no circuit?
Providing vocabulary definitions relevant to context
There are often several meanings of one word. It is part of the reason English is
one of the most difficult languages to learn. Providing definitions, that are relevant
to the context you are reading, will help with fluency
and comprehension of the
text. However, I always follow up with discussing other meanings of the word, so
that students are aware that there are more than one.
Actuator
A device that converts energy into an action such as motion. For example, a
pneumatic cylinder is a type of actuator that uses compressed air to push, lift, pull,
rotate, or open and close items.
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