Electricity Flashcards
Deck of flashcards intended for studying the electricity section of the AQA Physics A level specification.
What is charge?
Charge is the amount of electrons contained within a circuit.
What is charge’s SI unit?
Charge’s SI unit is coulombs.
What is charge represented as in equations?
Charge is represented as the letter ‘C’ within equations.
What is current?
Current is the rate which electrons flow past a point in an electrical circuit.
Essentially it is coulombs per second.
What is current’s SI unit?
Currents SI unit is Amperes also known as amps.
What is current represented as in equations?
Current is represented as the letter ‘I’ within equations.
What is voltage?
Voltage is the work done per unit charge between two points within a circuit.
It is also known as potential difference.
What is voltage’s SI unit?
Voltage’s SI unit is volts.
What is voltage represented as in equations?
Voltage is represented with the letter ‘V’ in equations.
What is resistance’s SI unit?
Resistance’s SI unit is Ohms (Ω). Ω is the Greek letter omega.
What is resistance represented as in equations?
Resistance is represented with the letter R in equations.
What is the equation which links:
voltage, resistance and current?
V=IR
What is Ohms law?
Ohms law states: ‘An ohmic components current is directly proportional to its voltage, given all physical conditions are kept constant.’
What is an example of an Ohmic conductor?
Resistors
What does the graph for a filament look like?
google it I’m not paying for premium lol
What does the graph for a LED look like?
google it I’m not paying for premium lol
What is resistivity?
Resistivity is a material property and is a measure of how well a material conducts electricity. This is given temperature remains the same.
What is resistivity’s SI unit?
Resistivity’s SI unit is ρ
What is resistivity represent as in equations?
Resistivity is represented as ‘ρ’ in equations
What is resistance?
Resistance is a measure of how difficult it is for charge carriers to move through an electrical component.
What causes a Thermistors resistance to change?
Temperature causes a thermistors resistance to change, as the temperature increases the resistance decreases.
This is the opposite of any other electrical component!
What is a super conductor?
What is the equation for resistance in series?
What is the equation for resistance in parallel?
