Circuit symbols Flashcards
What is the purpose of a cell?
provides a potential difference
What is the purpose of a battery?
provides a potential difference
What are the role of switches?
allows current flow to be switched on and off
What is the purpose of a voltmeter?
measures potential difference across a component
What is the purpose of an ammeter?
measures current flowing through a component
What is purpose of a fixed resistor?
provides a fixed resistance to the flow of current
What is the purpose of a variable resistor?
provides a variable resistance
What is the purpose of a filament lamp?
convert electrical energy to light energy as a useful form
What is the purpose of a motor?
converts electrical energy to kinetic energy as a useful form
What is the purpose of a diode?
allows current to flow in only 1 direction
What is the purpose of a thermistor?
resistance decreases when the temperature increases
What is the purpose of a LDR?
resistance decreases when the light intensity increases
What is the purpose of a LED?
a diode that gives out light when a current flows through it
How is an LED different to a filament lamp?
An LED will only allow electrical curent to pass through it in one direction
What are the 4 components that are commonly used to change/ control the amount of resistance?
thermistor, LDR, fixed resistor, variable resistor
