Switched on Flashcards
What is a cation and an anion?
A cation is a positively charged ion. An anion is a negatively charged ion.
How does current flow in a circuit?
Current is the direction going towards the flow of electrons. Electrons go towards positive from negative.
Compare series and parallel circuits.
Series - one path, parallel - multiple paths.
What happens to wire with increased length? Why?
If a wire’s length is increased, its electrical resistance should also increase. Because electrons have a higher chance of losing its energy to the lattice structure.
What is a lattice structure?
A structure with a regular structured, repeating pattern.
What does each pronumeral stand for in V = I R?
V - velocity/energy change
I - current - how much current is flowing through the circuit
R - resistance - tells us how much voltage is lost.
What is potential difference?
Another way of saying voltage.
What are features of parallel circuits?
The branch with the lowest resistance will have the highest current.
All branches in parallel circuits will have the same voltage.
What is the difference between luminous and non-luminous light sources?
Luminous light sources produce their own light whereas the non-luminous produces light by reflecting from another light source.
What are the 3 states of seeing through things?
Transparent - can see straight through e.g., clear water.
Translucent - Can partially see through e.g., frosty glass.
Opaque - can not see through at all e.g., piece of solid wood.
What is reflection?
The light bouncing back off a wave after hitting any surface. Angle of reflected ray is equal to the angle of incident.
What is refraction?
The CHANGE IN DIRECTION of a wave passing from one medium to another caused by its change in speed. E.g., travelling from water to air.
List one example of reflection and refraction.
Reflection - looking at yourself in a mirror
Refraction - Looking through a lens
What is the colour spectrum?
A band of colours produced by the separation of components of light by their different degrees of refraction according to frequency.
What is dispersion?
The separation of visible light into different frequencies.
