The gearing of this bicycle is very smooth.

This electric wire is an excellent conductor, transmitting electricity efficiently.

This machine takes energy from the power source and operates by transmitting it.

A large amount of electric current is flowing through this power line.

In this experiment, energy is measured in electron volts.

This battery uses high-quality electrolyte.

Which electrode of this battery is positive and which is negative?

He collected metal fragments using an electromagnet.

In this experiment, we changed the concentration of salt water to investigate the effect of osmotic pressure.

We went to the pool to beat the heat.