Energy Flashcards
What is internal energy?
The total kinetic energy and potential energy of all the particles that make up a system.
What is specific heat capacity?
The amount of energy required to raise the temperature of one kilogram of the substance by one-degree Celsius.
Specific heat capacity equation?
Mass * specific heat capacity * temperature change.
What is the method for specific heat capacity practical?
1) Set up the apparatus.
2) Measure the start temperature.
3)Switch on the electric heater for 1 minute.
4) Measure the end temperature.
5)Measure the voltage and current to find the power.
6) Repeat for different liquids.
7) Calculate the specific heat capacity.
8)Compare results.
What are the IV, DV and CV of the specific heat capacity test?
IV=The type of liquid.
DV= The temperature.
CV= Amount of liquid used and energy provided.
How can there be an energy transfer and what cannot it be?
It can be transferred usefully, stored or dissipated (spread out to the surroundings).
It cannot be destroyed or created.
What happens to energy in a closed system?
The total energy never changes but it transfers from one store to another.
How can you reduce unwanted transfers?
Lubrication, tightening any loose parts or thermal insulation.
What does the rate of cooling and thickness depend on?
The thickness and thermal conductivity of the walls.
What is the method of different materials as insulators?
1) Take 4 test tubes and wrap each one in a different type of insulation.
2) fill each test tube with hot water and measure the start temperature of each one.
3) Start the stopwatch and record the temperature every minute for 10 minutes.
4) Plot the results on a graph of time against temperature.
What are the IV, DV and CV of different materials as insulators?
IV= The type of insulation.
DV= The temperature.
CV= The times that the temperature is measured, the volume of water in each test tube, and the thickness of the insulating material.
Name 4 renewable resources.
Biofuel, wind, tidal and solar.
Name 4 non-renewable resources.
Nuclear fuel, coal, oil and gas.
