Physics, 31.05.2020 12:57 wichserc3399
A 5.5-kW water heater operates at 240 V.
i. Should the heater circuit have a 20A or a 30A circuit breaker? [2 marks]
ii. Assuming 85% efficiency, how long will the heater take to heat the water in
a 0.2085-m3 tank from 20°C to 80°C? The density of water is 1,000 kg/m3
and the specific heat capacity is 4,200 J/kg/°C.
Answers: 1
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Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.
Answers: 2
A 5.5-kW water heater operates at 240 V.
i. Should the heater circuit have a 20A or a 30A...
i. Should the heater circuit have a 20A or a 30A...
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