What are volts, amps, and watts?

I found this YouTube link to Tech Quickie volts amps watts explained

Watt is a unit of power, within electrical systems wattage corresponds to the amount of power that an electric device uses per second.

Volt is a measurement of voltage, volts represent the electrical potential difference or pressure.

Ampere or amp is a measurement of electrical current, amps represent the rate at which electricity flows.

The video does a good job. Basically P = IV, where P is power, or work per second, I is the rate at which electrons are flowing and V is the force with which the electrons move.

The water analogy works well. P is work per second or how quickly you could spin a wheel with the flowing water. I would be how much water per second you have, and V would be the force per drop of water.

They are units of currents see.
This answer is right on the money

Pwer is measure in Watts. Watts are Volts x Amps.

How much power or heat can aI get from this device? The device or my extension cord is rated for 15 amps. My wall socket delivers 120 volts so the most I can get out is 15×120 = 1800 Watts.