Wombat
Materials that allow the flow of electrons.
What is a conductor
How fast electrons is flowing I(A)
What is an Electric Current
Ability to impede the flow of electrons
What is Resistance
What is a DC Current?
Direct Current (battery)
The rate at which energy is produced (Watt)
Inhibits the flow of electrons
What is an insulator
How is an Ammeter connected?
Connected in series (A)
What is Ohms Law?
V=IR
What is an AC Current?
Alternate Current (Wall Outlet)
A measure when electricity is consumed in home, for different rates
What is a smart meter
Explain the formation of lightning
Electrons from clouds jump to trees to get discharged
The difference in electric potential
What is the Potential difference/voltage
When a lightbulb is added in series, the brightness of the bulb________?
Decreases
What is the Equation to find %efficiency
%Eff = Eout/Ein x 100%
List the non-renewable energies
Fossil Fuels
Oil
Nuclear fission
Explain a Lightning Rod
Metal that leads strikes from lightning to the ground away from the building
What are the 4 parts of an electric circuit?
-Source
-Load
-Connectors
-Control
Name 2 factors that affect Resistance
1. Material
2. Cross Sectional Area
3. Length
4. Temperature
What form of energy is the energy wasted as?
Heat, Sound
List 3 Renewable energies
Hydro
Tidal
Biomass
Geothermal
Wind
Solar
What are the 3 laws of charges?
1. like charges repel
2. Opposite charges attract
3. Like charges attract neutral objects
Charge by contact (using a negative rod) draw your answer in 4 steps
Objects touch and a neutral object becomes negatively charged
Calculate the voltage if a resistance of 500 Ω that has a current of 1.4 A flowing through it
G: R = 500 Ω
I = 1.4 A
R: V = ?
E: V = (I) (R)
S: V = (1.4) (500)
= 700 V
S= .: The voltage is 700 V
A light bulb uses 250 J of electrical energy and produces 80 J of light energy. Calculate the percent efficiency of the light.
G: Eout = 80 J
Ein = 250 J
R: % eff = ?
E: % eff = Eout / Ein x 100%
S: % eff = 80 J / 250 J x 100%
= 32%
S= .: The % eff is 32%
A laptop uses a 60 W adapter when it is plugged in. Electricity costs $0.075/kWh. Calculate how much it would cost to operate the laptop for 1 year for 18 hours per day
G: P = 60W = 0.060KW
$ = $0.075/kWh
t = 18 x 365
= 6570h
R: Cost = ?
E: Cost = P t $
S: = (0.06) (6570h) ($0.075/kWh)
= $29.57
S= .: The cost is $29.57