Admin Control Panel

New Post | Settings | Change Layout | Edit HTML | Moderate Comments | Sign Out O level A level A A1 A2 home private tuition physics chemistry mathematics maths biology trigonometry physics H2 H1 Science Score tutor tuition tuition tutoring tuition biology economics assessment exam exams exampapers exam papers NIE JC Secondary School Singapore Education tutor teach teacher school student agency

O lvl Phy: Transfer of Heat Energy

The figure below shows a household hot water system.


(a) State the process by which the hot water rises from the boiler to the hot water tank.

(b) Through which pipe, P or Q, does the heated water rise from the boiler to the hot water tank? Explain your choice.

(c) State the purpose of pipe R.

(d) What is the name and purpose of pipe S.

*************************

Answer:

(a) Convection

(b) Pipe P.
Hot water is less dense than cold water. Thus, hot water in the boiler will rise, and exit the boiler through pipe P to reach the hot water tank. In the hot water tank, the colder water, being denser, will sink, and exit through pipe Q to reach the boiler.

(c) Pump cold water to the lower half of the water tank to be transferred to the boiler via pipe Q for boiling/heating.

(d) Pipe S is the overflow pipe attached to the tap of the hot water tank just in case the temperature of the water becomes too high and cause a large expansion of the hot water. The excess water will flow back into the cistern.



Related Articles by Categories



Singapore's first free online short to
medium questions and solutions database



Related Posts with Thumbnails