Renewable Energy
What is the technology called that we use to harness energy from the sun
Solar Panels
What is waste energy?
Energy that is either produced but not used, or used inefficiently, resulting in a loss of potential energy.
What is voltage?
Voltage is the strength of an electrical current.
What is a current?
An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.
What is a Joule?
Unit of measurement for energy
Name two benefits of renewable energy.
- reduce carbon emissions - doesn't contribute to climate change
- can be replenished in our lifetime
What is potential energy?
It is stored energy.
What does an ammeter measure?
An electric current within a circuit.
True or false:
An open switch in a circuit involving a light bulb would cause the light to go on.
False.
An open switch = an open circuit, meaning a disruption in the current.
What is a Watt?
The rate at which energy is converted
What is renewable energy?
Energy derived from natural resources that are replenished on a human timescale.
What is kinetic energy?
The energy of an object in motion.
What is a parallel circuit?
Components are connected in separate branches, each with its own path to the power source. Current splits and flows through each branch independently. If one branch fails, the other branches remain functional.
Example: Household wiring.
What a series circuit?
Components are connected one after another in a single loop. Current flows through each component in sequence. If one component fails, the entire circuit breaks.
Example: A string of Christmas lights.
What is a volt?
The unit of measurement for electrical potential difference.
Describe a disadvantage of renewable energy.
Relies on natural forces, not always available.
High initial costs.
Intermittency of availability can affect the voltage.
A toaster turns electrical energy into heat and light. Use the idea of conservation of energy to describe what happens to the energy.
Energy is not lost; it changes form.
Electrical energy becomes heat (to toast) and a little light.
Define Ohm's law
Ohms Law states that the current through a conductor between two points is directly proportional to the potential difference across its ends. Mathematically, the law states that V = IR, where V is the potential difference or voltage, I is the current, and R is the resistance of the conductor.
What is an open circuit?
A circuit with a break or gap in the path, preventing current flow.
What is an ampere?
Often shortened to amp, it is the unit of electric current.
When the sun isn't shining and the wind isn't blowing, how could power grids ensure a consistent supply of energy without the use of fossil fuels?
Batteries
What is the law of conservation of energy?
Energy can never be created or destroyed, only changed from one form to another.
if voltage = current x resistance or V = IR
What is the voltage of a circuit with a 2 amperes and 5 ohms
10 volts
(useful energy out/total energy in) x 100 = ?
% efficiency
What is an ohm?
The unit of measure for electrical resistance.