Final answer:
Fusible metal plugs are soft metal plugs that melt at specific temperatures, and the correct answer is c. 200-220°C.
Step-by-step explanation:
Fusible metal plugs are soft metal plugs that melt at specific temperatures.
The correct answer to the question is c. 200-220°C. This means that fusible metal plugs will melt when the temperature reaches between 200 and 220 degrees Celsius.
One important use of fusible metal plugs is in electrical circuits as a safety mechanism. The metal plug melts when there is excessive current, breaking the circuit and preventing damage or hazards.