Lab#11: Electrical Heat Equivalent Experiment 1. A calorimeter cup with electric

Question

Lab#11: Electrical Heat Equivalent Experiment 1. A calorimeter cup with electrical heater is used to warm up 100g of water. The voltage on the heating coil is measured to be 12V and the current is 3A. The heater is turned on for a time period of 1Ominutes. What is the electrical energy (in Joule) used in this experiment? (5) A) 4.186 B) 33.7J D21600J C) 360J 2. If20.0 calories of work is transferred as heat, how many Joules of heat is there? (assume all work is transferred as heat) (5) A) 4.18 J/Cal B)20.0 J C) Work and Heat cannot be related D) 83.6

Explanation / Answer

2. 1 cal = 4.184 Joules

so 20 cal = 20 x 4.184 = 83.68 J  

Ans(D)

1. P = V I = 36 W  

energy = Power x time = 21600 J

Ans(D)

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