Energy Flashcards
(22 cards)
What is the calculation for kinetic energy
Kinetic energy = 0.5 x mass x (speed)^2
What is the calculation for gravitational potential energy (G.P.E)
G.P.E = mass x gravitational field strength x height
What is the unit used for specific heat capacity
J/Kg °C
What is specific heat capacity
The specific heat capacity of a substance is the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius.
What is the definition of power
Power is defined as the rate at which energy is transferred or the rate at which work is done
What are both the equations for power
Power = energy transferred
___________________
Time
Power = work done
___________
Time
Can energy be created or destroyed
No, but it can be transferred and stored
Explain 2 ways of reducing unwanted energy transfer
Lubrication and thermal insulation
What is the calculation for efficiency
Efficiency = Useful power output
_____________________
Total power input
Describe ways to increase the efficiency of an energy transfer
What are the 2 main energy sources used
Renewable
Non-renewable
What does it mean for an energy source to be renewable 7
What is the equation for charge flow
Charge flow = current x time
Wha is the equation for potential difference
Potential difference = current x resistance
What is the definition of current, resistance, potential difference
Current -
Resistance -
Potential difference -
Explain how a thermistor and an LDR work
Thermistor -
LDR -
What is a series circuit and describe some characteristics
• there is the same current through each component
• the total potential difference of the power supply is shared between the components
• the total resistance of two components is the sum of the resistance of each component.
What is a parallel circuit and describe some characteristics
• the potential difference across each component is the same
• the total current through the whole circuit is the sum of the currents through the separate components
• the total resistance of two resistors is less than the resistance of the smallest individual resistor.
What is the equation for power
power = potential difference x current
power = (current)^2 × resistance
What is the equation for energy transferred in an electrical circuit
energy transferred = power x time
energy transferred = charge flow x potential difference
What is the equation for density
density = mass
_______
volume
What is the definition of internal energy
Internal energy is the total kinetic energy and potential energy of all the particles that make up a system
