Electricity Flashcards
Electrical energy
Energy that comes from a charge.
Current electricity
The flow of electrons through a circuit.
Electric circuit
A loop that allows electrons to flow continuously .
Ammeter
An instrument used to measure current .
Ampere or amp.
Unit for current.
Electron
A negatively charged particle
Electrons always flow from the ______ of the battery to the _______ .
Negative pole, positive pole
Insulator
A material that does not allow current electricity to flow. Ex: plastic
Conductor
A material that allows current electricity to flow. Ex: copper
Resistance
How difficult it is for a current to flow through an electrical component.
Ohmemeter
An instrument used to measure resistance.
Units for resistance
Ohms
Fixed resistor
A resistor with a set resistance
Variable resistor
Allows you to change the resistance
Potential difference/voltage
A pushing force from an electrical power source that makes electrons move through a circuit.
Ohms law
When The relationship between voltage and current is directly proportional.
Power
Is the rate at which one form of energy is transferred to another.
Power formula
Power= work
——
Time
Electrical power
The rate at which electrical energy is transferred into another form of energy.
P=vxi
Electrical power unit
Watts
Series
Connected in a single loop
Parallel
Connected in more than one loop or branch
Dc
Direct current, a current that always flows in one direction. Ex: battery
Ac
Alternating current: a current that keeps changing direction
- cheaper and easier
Earthing
Connecting an electric device with the ground.
Rectifier
Converts alternating current to direct current
Diode
Only allows the current to flow in one direction
Led
Light emitting diode, gives out light when a current flows through it
- more energy efficient
- longer lasting
Ldr
Light dependant resistor, resistance that changes depending on light intensity.
Ex: street lamps home alarms,
- dim light= high resistance
- bright light= low resistance
