Where can I find springs that are the same size as the ones in a mechanical pencil

The material that keeps its new shape after it is stretched is called?

What are the necessary conditions for fusion?

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit