MCQ Flashcards
What type of energy does not come from the sun? (1)
Geothermal energy
What types of energy does come from the sun? (2)
Wind and wave
2 features affecting sensitivity on thermometer
- mass of liquid
- diameter of liquid thread
What 2 things happen when waves slow down?
- wavelength decreases
- bends towards normal
How to make a permanent magnet? (2)
- steel and d.c. current
- hammer, align with north - south
What factors affect resistance? (2)
- directly proportional to length
- inversely proportional to area
2 features of a transformer:
- magnetic field changing in soft iron core
- magnetic field changing in secondary coil
What is rule of momentum
M1V1+ M2V2
What is pressure due to in gas particles in a container?
When gas particles collide with the wall, pressure is due to change in momentum
What is the purpose of relay
Magnetic effect
Application of a relay
allowing a small current to switch on a large current
How does increasing transmission voltage reduce power loss?
Decrease in current, reducing thermal energy loss
OTHER formula for impulse
m(vf-vi)
When is there most elastic stored energy in a spring?
When mass moves up
When is there least gravitational potential in a spring)
When mass moves down
