OCR physics B21C – P2
Kinetic energy
In physics, the kinetic energy (KE) of an object is the energy that it has due to its motion
Specific heat capacity
Specific heat capacity is how much heat energy is required to raise 1kg of a substance by 1 degree Celsius
Power
The quantity power is the rate at which work is done. The quicker work is done the greater the power
Work done
When a force causes an object to move, work is being done on the object by the force
Elastic potential energy
Stretching or squashing an object can transfer energy into its elastic potential energy store
Charge
The size of the current is the rate of flow of charge. Electrons are negatively charged particles and which transfer energy through wires as electricity
Resistance
Resistance is an electrical quantity that measures how the device or material reduces the electric current flow through it
Electrical power
The power of an appliance is the energy that is transferred per second. Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit
Density
Density is a measure of how compact the particles are in a substance. Density is defined as the mass per unit volume
Specific latent heat
Specific latent heat is the energy needed to change the state of a substance
Gravitational potential energy
Lifting an object in a gravitational field transfers energy into the objects gravitational energy store
Efficiency
The efficiency of a device is the proportion of input energy that is converted to useful energy
Energy transformed
The potential difference between two points is the energy transferred per unit charge. An electrical circuit is an energy transformation device.
