Science Demo Electricity Flashcards
difference between static and current electricity
Static
Electrons gather in one spot and then move randomly
Current
Controlled steady flow of electrons
Things that a simple circut have
Load: part of electric circuit that converts electrical energy into other forms of usable energy
Energy source: where the electrical energy comes from
Switch: device that controls flow of electrons by breaking or completing the circuit
Electrical wires: pathway for electrons to travel
electrical energy is…
Created by the flow of current electricity
A short circut is…
Accidental connection between two points in a circuit
Can be very dangerous
Electric cella are…
Portable device that converts chemical energy into electrical energy
The chemical reaction causes a positive end and a negative end
Battery in the primary cell and secondary cell
Primary cell: cannot be recharged
Secondary cell: can be recharged
What is direct current?
Electrons flow in one direction through a circuit
Produced by an electric cell (battery) to power electric device
What is alternating current?
Electrons move back and forth, changing directions
More efficient method of distributing electrical energy over long distances
Characteristics of electrical generators…
Converts kinetic energy into electrical energy
External energy source spins the turbine which turns the coil of wire
Since the coil is moving near a magnet, the magnetic force forces electrons to move through the wire
Components: turbine, wire coil, magnet
How to find power (w), time (s), or Joules (j)
J= WxS. W=J/t. T=J/w Sometimes joules is kilojoules (/1000)*
cost of electricity formula
Cost = power used x time x cost of electricity
Watts needs to be in kilowatts (/by 1000)
Energy efficient formula: not all energy is put to use,
*E out= produced
*E in= used
The Triangle:
E Out over %/100 beside E In
