Describe the energy conversions that take place in a bicycle lighting system powered by a dynamo

Sunshine = = > stored in plants

Eat the plants = = > energy stored as fat and glucose in the body

When needed, food energy = = = > muscles.

Muscle energy = = = > work, on the pedals

Mechanical energy into the pedals==> torque on the sprocket = = > tension in the chain = = > torque on the gear = = > spin the backwheel

Rotation of back wheel = = > friction with the ground = = > force against the ground = = > reaction force against the back tire = = > work, on the bicycle = = > bicycle accelerates

Bike moving, has kinetic energy = = > friction with the ground = = > front wheel rotates

Rotational energy of front wheel = = > friction between the tire and the rubber wheel of the dynamo

Rotational energy of the dynamo = = > converts to electrical energy inside

Eletrical energy flows through wires to light bulb

In the light bulb:

Electrical energy = = > light energy and heat energy