November Mocks Flashcards
Speed of em waves in a vacuum
3 x 10^8
Law of reflection
Angle of incidence = angle of reflection
What is friction
The force that opposes motion
What is hookes law
Force is proportional to extemsion
What is Newton’s third law
For every action there is an equal and opposite reaction
What is ohms law
Current is proportional to voltage
What is voltage
The energy transferred per unit charge passed
What is a volt
A joule per coulomb
Characteristics of current and voltage in a series circuit
Voltage is shared
Current is constant
What colours are the wires in a plug
Earth - yellow and green
Neutral - blue
Live - brown
What is double insulation
When the outer case is made of plastic
Why do we need the earth wire/earthing
Stops the metal body of the appliance from becoming live (if the live wire becomes loose and touches the metal body the current flows through the earth wire and then the fuse and so the circuit is broken
What is an alternating current
A current that moves back and forth in two directions CONTINUOUSLY
Give one example of a way to create a direct current
Using a battery
