Vocabulary
What is current?
The flow of electrons
V=IR
Components in a single closed loop.
Series
Most of Australia's electricity comes from what?
Burning fossil fuels
Name the 3 variables in an experiment.
Independent, dependent, controlled
What is resistance?
How difficult it is for the electrons to flow.
10 A of current flows through a 2 Ω resistor. What is the voltage?
20 V
Components connected in multiple loops.
Parallel.
Coal, natural gas and oil are all examples of what?
Fossil fuels
Which variable do you measure in an experiment?
Dependent
What is an ohm?
The unit of resistance
12 V is applied to a 10 Ω resistor. What is the current?
1.2 A
If one component breaks, the other components still work.
Parallel
What is the major disadvantage of burning fossil fuels?
Produces carbon emissions (greenhouse gas) which contributes to climate change.
What word should an aim always start with?
To
What is a circuit?
A complete circular path that current flows through.
A 20 Ω, 30 Ω and 50 Ω resistor are connected in series with a 12 V battery. What is the current?
0.12 A
Voltage is shared.
Series
Give 3 disadvantages of renewable energy.
-Not available 24/7
-Low efficiency
-High initial cost
-Needs a lot of space
-Disposing of expended solar cells, etc.
How do you improve the validity of an experiment?
Control variables
Difference in potential energy per unit charge between two points.
A battery is in parallel with a light bulb AND a pair of 25 Ω resistors. If 1.4 A flows through the resistors, what is the voltage across the light bulb?
70 V
Current is shared.
Parallel
Explain how a turbine produces electricity.
Faraday's law, etc.
What is accuracy AND how do you improve it?
How close you are to the true value AND improve it by using precise equipment.