1 - Conservation and Dissipation of Energy Flashcards
A system is…
An object or a group of objects.
A closed system is…
Where energy is not wasted or taken in from outside of the system.
Weight is measured in…
Newtons.
The weight of a 1kg object is…
10N.
How can energy be wasted?
Friction Resistance Heat Noise Light
How can we improve efficiency?
Lubricate - reduce friction
Tighten loose parts - less vibration
Streamline - reduce air resistance
Reduce electrical resistance in wires
Electricity is…
A flow of charge that transfers energy from one energy store to another.
Charge is…
The unit of electricity flowing around a circuit.
Current is…
The flow of electrons around a circuit.
How do clockwork appliances work?
Winding them up increases the Elastic Potential Energy of a spring inside. As it unwinds, kinetic energy is released.
Power is…
How much energy is transferred to an appliance per second.
