Questions Corrections Flashcards
What is zero error
Ammeter displays a reading when not connected to a circuit
In a LED torch the cells were put in the wrong way around. Explain why the torch did not work
Charge will not flow through a diode in the reverse direction as a diode has a very high resistance in the reverse direction
3 environmental advantages of gas fired power stations vs coal fired power stations
1) Less global warming
2) Gas mining is less destructive than coal mining
3) Less CO2 released
What kind of thermistor would be the most suitable to measure the surface temperature of the sea
A thermistor with the greatest resistance change between 0 and 25 Celsius
Describe the process of Nuclear fission inside a nuclear reactor
1) Neutron absorbed by a uranium nucleus
2) Nucleus splits into two parts
3) and neutrons are released
4) and gamma rays are emitted
Explain how the process of nuclear fusion leads to the release of energy
1) Lighter nuclei to form heavier nuclei
2) some of the mass of the nuclei is converted to energy
Explain advantage of the radioactive waste having a shorter half-life
Activity decreases quickly
Risk of harm decreases quickly
What two measurements are needed to determine speed of rider and sled on a water slide
Length of the sled
Time for sled to pass light gate
When the kettle is switched on the temperature of the water did not immediately start to increase suggest why.
The heating element of the kettle takes time to heat up
Suggest why at the bottom of the slide all riders and their sleds have approximately the same speed
1)Decrease in gravitational potential energy means an increase in kinetic energy
2) The masses cancel on both sides of the equation
3) so speed only depends oh height and gravitational field strength
4) Variations will be due to air resistance/friction
