June 2014 Flashcards
Movement of particles in steam?
Random movement.
How can a seatbelt reduce injury to passengers?
- longer time of impact.
- reduces force.
- passenger stays on seat.
How can anomalous result lead to the idea of a positive charge at the centre of an atom?
Charge is concentrated at centre and like charges repel.
Why is it important to carry out experiments in physics?
- validate theories.
- test hypothesises.
Why is it better to use a graph to calculate the refractive index?
- method allows for anomalies.
- value relates to all the data collected.
Equation linking input voltage, output voltage and turns ratio for the transformer?
Vp/Vs = Np/Ns
How does a transformer work?
- it steps up or steps down the voltage.
- current in coil produces magnetic field.
- the current is changing.
- causing a magnetic field in core.
- the core strengthens magnetic field.
- field lines interact with coil.
- which induces voltage in secondary coil.
How does location affect geothermal power?
Accessibility of hot water.
How does location affect solar power stations?
Sun angle.
How does the climate affect geothermal power?
It isn’t affected by climate.
How does climate affect solar power stations?
- hours of sunlight.
- intensity of sun.
