The given observation table is used to determine the value of mechanical equivalent of heat. The electrical energy (W) consumed will be
Correct answer: C. 20 J
- A. 5 J
- B. 10 J
- C. 20 J
- D. 40 J
Explanation
The electrical energy (W) consumed can be calculated using the formula:W = V × I × tWhere: * V = Potential Difference = 5 volts * I = Electric Current = 2 amperes * t = Time = 2 secondsSubstituting the values into the formula:W = 5 V × 2 A × 2 sW = 20 Joules (J)Therefore, the correct answer is C) 20 J.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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