Why is relay used?

Relays are used wherever it is necessary to control a high power or high voltage circuit with a low power circuit, especially when galvanic isolation is desirable. In an automobile, a starter relay allows the high current of the cranking motor to be controlled with small wiring and contacts in the ignition key.

What does rely mean?

to be dependent

What does it mean when you rely on someone?

1 : to need (someone or something) for support, help, etc. : to depend on (someone or something) My mother relied on me for financial support. They rely on a well for all their water. 2 : to trust or believe (someone or something) She’s someone you can rely on.

What does rarely mean?

not often

How do you spell scary?

Scary (scarey) is an adjective used to describe something or someone that causes fear or terror. For example: “The horror movie was really scary.” ! Note – Just remember “I’m scared of scary things, but I’m not scary.”