Physics Flashcards
Is geothermal a renewable or non renewable energy resource?
Renewable
How are voltmeters connected in a circuit
In parallel around the component you are measuring the potential difference of
What is the equation that links current, resistance and potential difference
V=IR
How do you convert mA to A
Divide by 1000
What sort of error would be caused by the same equipment and method giving two different readings
Random
What does a step-up transformer do
Increase potential difference
How do step-up transformers improve efficiency in the national grid
Decreases current so reduces energy and loses as heat in the cables
What is the circuit symbol for an LDR
(Picture)
What is the relationship between light intensity and resistance for an LDR?
As light intensity decreases resistance increases.
10
What is the equation that links power current and resistance
P= I2 XR
What is peer view
Scientists check each other’s work before publishing to the public
What property of nuclear radiation causes an increased risk of cancer?
Ionising
What is the unit for activity of a radioactive source?
Bq
What is the range in air of alpha radiation?
Few cms
What is the range in air of beta radiation?
Several ms
What is the range in air of gamma radiation?
Several kms
Define half life
The time taken for half the nuclei in a sample to decay.
Why can radioactivity never be predicted?
It is a random process
What is the equation that links gravitational potential energy, mass, gravitational field strength and height?
Ep= mgh
In terms of energy what is a closed system?
A system which no energy enters or leaves
What is the relationship between the temperature and pressure of a gas?
As temperature increases so does pressure
What causes pressure in gases
Force of the particles colliding with the walls of the container
What is the equation that links mass, density and volume?
Density= mass/volume
