Which is the smallest unit?

Answer 1

The smallest unit of electric charge is the charge on an electron. It's not possible

to split that amount of charge in pieces.

-- 6,241,509,752,000,000,000 of them make 1 coulomb of charge.

-- When that many of them flow through your ammeter every second,

the meter reads 1 Ampere of current.

-- It takes 1 joule of energy to lift that many of them through 1 volt of potential difference.

When you let the same number fall down through the volt, they give back the joule.

-- The proton has the same amount of charge, but it has opposite polarity.

Whatever that really means.

Answer 2

Energy is measured in Joules and small amounts can be measured in microjoules, nanojoules etc.

Answer 3

The smallest unit of energy is the Planck. This unit of energy is named after Max Planck and is in the natural system of energy.

Answer 4

I think the quark is the smallest unit discovered so far.

Answer 5

Photon