The motor stores energy for a long time and cannot be restored

How does a battery powered toy car move along the floor?

A battery powered toy car moves along the floor: Energy flows from a store to a store. When an Energy System changes, energy may flow or transfer from one energy store to another. For example, in our Heat Engine, if both Sources are at the same temperature (both "cool") then no energy will flow between them.

How does a motor-generator work?

As the flywheel stores energy, it speeds up, and when it discharges, it slows down to release the stored energy. To make this happen, a motor-generator (MG) unit drives the rotating flywheel, converting electrical energy to mechanical energy, and vice versa. They’re connected in a way that controlling the MG also controls the flywheel’s operation.

What are energy stores?

Quite simply, Energy Stores are ways in which energy can be stored, occasionally for a long time, but often for very little time. A Gravitational Potential store - energy is stored in an object raised up against the pull of gravity, for as long as the object is raised up.

How does a student use an electric motor to lift a load?

A student uses an electric motor to lift a load. As the motor turns, energy is transferred to the load as the string and the pully lift it up. a) State the useful energy transfer happening in this system. b) State the main wasted energy transfer happening in this system. Answer: Part (a) Part (b)

How many energy stores are in a heat engine?

An Energy System consists of an object or a group of objects that are themselves Energy Stores. So, if we take the Heat Engine example from our previous page, the whole Heat Engine is the Energy System, and it consists of the 3 Energy Stores, numbered 1,2 and 3. Let's repeat the Heat Engine diagram here:

What happens to energy when it is used up?

In reality, energy is never used up; it’s simply transferred or transformed into different stores. For example, when a light bulb is on, electrical energy transfers into light and heat energy. The total amount of energy stays the same, but it moves between stores, this follows the Principle of Conservation of Energy.