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Key Stage 3 Science

QuestionAnswer
Describe Internal energy and state 3 factors that affect the amount of internal energy stored in an object
What is evaporation and describe how evaporation causes cooling Evaporation is the process of a liquid turning into a gas. During evaporation, energy is transferred away from the liquid with the vapour, leaving the liquid behind with less energy and as such at a lower temperature
How is energy transferred by conduction, convection and radiation and give an example of each.
Describe thermal insulators along with 3 examples and how each are used to prevent heat transfer
Explain why it is a good idea to paint solar panels black and houses in the tropics white.
Define efficiency and state the equation of efficiency. Then calculate the efficiency of a television that uses 160J of energy per second and transfers 110J to heat, 15J to sound and 25J to light Efficiency is the ratio of the useful energy transferred to the total energy supplied to a device. the equation for efficiency is; Efficiency =useful energy/total energy Eff = U.E./T.E. = 15J + 25J / 160J 40J/160J = 0.25 or 25% 8Kd
State the purpose of the thermos flask and list three features that helps it to carry out its function effectively
Define Power and state the 2 most common units of power used, also state the formula connecting power, energy and time Power is the rate of transfer of energy. The 2 most common units of power are the Watt (W) and the kilowatt (KW). The formula that connects power, energy and time is Power = Energy transferred/time P = E/t
7.2kJ of energy is supplied to an appliance over a time of 15 minutes. What is the power rating of the appliance P = E/t = 97200J / 15x60 s = 97200J/900s = 18W
State what does temperature describes along with the usual unit of temperature and the instrument used to measure temperature Temperature describes how hot or how cold an object is. The usual units of temperature is degrees Celsius and the instrument used to measure temperature is the thermometer
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