physics exam revision Flashcards
(23 cards)
What are joules?
The unit for energy
What are watts?
The unit for power
What is one joule of energy equivalent to?
Joule of energy = watts of power x seconds of time
And lifting an apple
What does power tell us?
how many joules of energy something uses or produces each second
What’s the formula for joules and watts?
Joules = watts of power x seconds of time
Watts = joules of energy divide seconds of time
What are the different types of energy we give?
Thermal energy, sound energy, light energy, nuclear energy, kinetic energy,
elastic potential energy, gravitational potential energy, chemical potential energy and electrical energy
*know how to draw flow diagrams showing simple energy transformations
.
know how to draw series and parallel electrical circuits ep
Including batteries, globes, voltmeter and ammeter using correct symbols
What is the difference between an ammeter and a voltmeter?
An ammeter measure the flow of current whereas the voltmeter measures the voltage across any two points of the electrical circuit.
What are the different types of wave we have?
Transversal wave - a wave that wobbles the medium from side or side or up and down
Longitude - a wave the wobbles the medium backwards and forwards
What are the different media sound can travel through?
Sound can travel through anything that has a medium. Eg water, air, wood etc
Speed formula:
Speed = distance divide time = d/t
What is a rarefaction and compression regarding a sound wave?
Rarefaction = a region in a longitudinal wave where the particles are furthest apart
Compression = a region in a longitudinal wave where the particles are closest together
know how to label Low and high frequency sound waves (ep)
.
What are the units for sound and frequency of sound?
the unit for sound is decibel (dB) and the unit for sound frequency is hertz (Hz)
*be able to draw and label the different parts of the ear
.
What is a medium?
Anything that contains particles.
Frequency, wavelength and amplitude:
The frequency of a wave is caused by the number of vibrations a noise makes each second
Wavelength is low long a wave is (unit meters)
Amplitude is the maximum displacement or distance moved by a point on a vibrating body or wave
High frequency and low frequency sound waves:
High frequency = compressions are bunched closer together and have a short wavelength
Low frequency = compressions are spread out and have a long wavelength
What is energy?
If something has energy, we can see that it is active and that it can do things and make things happen
What is power?
The rate of doing work or transferring heat, the amount of energy transferred or converted per unit time.
What is voltage?
the measure of the amount of electrical energy gained or lost by electric charge as it moves through the circuit. It is also known as potential difference
What is current?
the measure of the amount of electric charge / electrons passing a point in an electric circuit.
