Sebuah solder dayanya30 watt memiliki hambatan 120 Ohm. Tegangan solder adalah....
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R = 120 ohm
dit: V = ...?
jwb:
V² = P×R
V² = 30×120
V² = 3600
V = √3600
V = 60 volt.
jdi, tegangan yg dmliki olh solder adalah 60 volt.