Fuse wire is made of_____________?
Correct answer: A. 63% tin and 37% lead
- A. 63% tin and 37% lead
- B. 63% lead and 37% tin
- C. 63% tin and 37% aluminum
- D. 63% lead and 37% aluminum
Explanation
Traditional solder is a low-melting alloy of about 63% tin and 37% lead, allowing it to melt and join components without melting them. Many modern solders now avoid lead for health and environmental reasons.
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Chemical principles appear in acids, bases, salts, solutions, oxidation, combustion, corrosion and neutralisation, along with the composition and uses of common substances. Coverage includes soaps and detergents, fertilizers, medicines, food preservatives, polymers, fuels and water treatment, while distinguishing physical changes from chemical reactions.
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