AP2 Flashcards
What is power?
The rate of energy transfer
What is electrical power?
The rate at which an electrical appliance transfers energy by electrical working
What are the 3 equations for power?
Power= energy/time
Power=current* potential difference
Power= current 2 * resistance
What does a step-up transformer do?
.Increases potential difference
.Decreases current
.Reduces current which reduces heating in wires
.Makes it more efficent
What happens to wasted energy?
Dissipated into the surroundings
What does a step-down transformer do?
.Decreases potential difference
.So it is safer
Kinetic energy formula
0.5massvelocity2
Charge formula
Current* time
Gravitational potential energy formula
Massgravitational field strengthheight
What is direct current?
Only flows in 1 direction
What is potential difference?
Energy transferred by each coulomb of charge
What is the national grid?
A network of pylons,transformers and cables that distribute electricity around the country
What happens to the resistance when the temperature of the thermistor decreases?
Increases
What does TURD stand for?
Temperature up resistance down
What is the equation for force applied to a spring?
Force applied to a spring+spring constant~extension
