Answer is:
37% lead and 63% tin
Explanation:
Electricians solder consists of 37% lead and 63% tin.
Answer is:
straight polarity is used
Explanation:
Direct Current Straight Polarity (DCSP) or Direct Current Electrode Negative (DCEN)—When electrode is connected with the negative terminal of the power source and base metals are connected with the positive terminal.
Metals with high melting temperature (such as stainless steel, titanium) can be suitably joined by DCSP.
Direct Current Reverse Polarity (DCRP) or Direct Current Electrode Positive (DCEP)—When base metals are connected with the negative terminal of the power source and electrode is connected with the positive terminal.
Metals with low melting temperature (such as copper, aluminum) can be suitably joined by DCSP.
Answer is: