Conservation of Energy Flashcards
What is meant by the law of the Conservation of Energy?
Energy cannot be created or destroyed, but can be changed from one form into another.
What is the equation for work done?
Work done = Force x Distance
W = Fd
An object raised up to a high position is said to have …
Gravitational potential energy
What is the equation for potential energy?
Potential energy = mass x gravitational field strength x height
Ep = mgh
What is the gravitational field strength?
9.8 N/Kg
What energy does a moving object have ?
Kinetic energy
What is the equation for kinetic energy?
Kinetic energy = a half x mass x velocity squared
Ek = 0.5 x mv(^2)
Potential energy @ TOP = Kinetic energy @ BOTTOM
Just remember this lol x
Power efficiency equation
Power efficiency (%) = (Power Out / Power In) x 100
Energy efficiency equation
Energy efficiency (%) = (energy out/ energy in) x 100
What is energy measured in?
Joules (J)
Power is the measure of …
The rate of energy conversion
Power is measured in …
Watts
Equation for power
Power = Energy / time
P= E/t
What are the two types of electrical charge?
Positive and negative
Opposite charges …
Like charges …
Opposite barges attract
Like charges repel
Materials which allow electricity to flow are …
Conductors
Materials which do not allow electricity to flow are called …
Insulators
What is electric current ?
Electric current is the measure of the flow of charge around a circuit and depends on the amount of charge passing any point in a circuit every second
What is the symbol for electrical charge and what is it measured in?
Symbol Q
Measured in Coulombs (C)
What symbol is electrical current given and what is it measured in?
Symbol I
Measured in Amperes / amps (A)
What is the equation for charge?
Charge = current x time
Q = It
What does a.c and d.c stand for?
Alternating current and direct current
What is alternating current mostly produced by?
Alternating current is produced by most generators and is used in mains electricity
