HV Exit Exam • Set 3 Question 22 of 30

The heat produced at an electrical contact point owing to current flow is least affected by:

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Direct Answer

Option A: Temperature of the surrounding medium

Heat generated at contact points is determined by Joule's Law (Q = I²·R·t). Surrounding ambient temperature has minimal direct influence on the heat generation rate compared to I, R, and t.

All Options

Temperature of the surrounding medium (Correct Answer)

Contact resistance

Magnitude of electric current flowing

Duration of current flow

Detailed Explanation & Context

Heat generated at contact points is determined by Joule's Law (Q = I²·R·t). Surrounding ambient temperature has minimal direct influence on the heat generation rate compared to I, R, and t.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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