SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY
Fuse. Hand inserting a fuse into its socket. The yellow colour of the socket indicates that this is a 20 ampere fuse. This means that it will melt and break the circuit if the current flowing through it exceeds 20 amps. This is designed to protect circuits and electrical devices from power surges.
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