Electrical Gadgets Revision Flashcards
(27 cards)
Define what static electricity is.
Its created when positive and negative charges aren’t balanced.
What is current electricity?
Current is the flow of an electric charge within a conductor
What are the differences between static and current electricity?
Current electricity is made by the flow of electrons down a conductor, where static electricity is caused by the build up of electrical charges on the surface of things.
What is the interaction between electric charges called?
electric force
How do objects become charged?
when two materials come into contact or are rubbed together.
What is an example of electrical energy?
batteries, lightning, and electrical charges moving through a wire plugged into the wall socket to power electrical appliances such as televisions and computers.
Name 3 types pf electrical energy.
electrical, chemical, heat
What is a conductor?
a substance or material that allows electricity to flow through it.
What is an insulator?
a material that doesnt allow energy flow through it
What is an electric current?
the flow of electricity in an electronic circuit, and to the amount of electricity flowing through a circuit
What does resistance mean?
a measure of the opposition to current flow in an electrical circuit.
What does ohm’s law include?
V - voltage
I - current
R - resistance
What is magnetism?
Magnetism is the force applied by magnets when they attract or repel each other
Why is magnetism important?
because we use it to create electrical energy.
Unlike poles ____, like poles _____
attract
repel
Define voltage, current, resistance and power.
Voltage - the “pressure” that pushes electricity
Current - flow of electricity
Resistance - the amount that an object impedes or resists in an electric current
Power - time rate of doing work or delivering energy,
What are the units for voltage, reistance, power and current?
V
ohms/Ω
W
A
Explain why a circuit with one bulb has more voltage than circuits with more bulbs.
Because voltage gets shared lightbulbs, hence these bulbs have lower voltage than the circuit.
Anmeters and voltmeters have to be in which circuit?
series
pararel
What is an ammeter and a voltmeter?
Ammeters measure the current of a circuit
Voltmeters measure the voltage drop across a resistor
Name reasons why parallel or series circuits are better to use for house wiring.
Parallel circuit:
What does VIR, PIV, DVT, represent and what is its purpose?
VIR: to find voltage, current and resistance.
PIV: to find power, current, and voltage
DVT: to find distance, velocity and time.
What type of particles moves the balloon when rubbed onto the jersey?
electrons
What type of electricity allows balloons to stick to the jersey?
static electricity
