Nothing to do with a LDV van? Baddie the Pirate talks LED lighting for your motorhome too.

This is the simplest and clearest explanation I found on the net about electricity.
How does it relate to LDV vans? Pilots and Convoys are often purchased for camper conversion!
Having been at the school of "nothing hands-on" I've struggled for so long at understanding what Volt, Watt, Amps etc relate to and how they work together. Thanks to the school of "nothing hands-on" I can read and write well enough so I'm gonna share what I found with you with no further adue!

Source: Baddiethepirate

"MATHS

The units that are used to measure electricity are:

• Volts:  Electrical force of pressure behind the electrons in a circuit. Like water pressure or PSI for air. (Usually 12v on a narrowboat). 
• Amps:  The number of electrons flowing past in a second. Like litres per second in a pipe, it defines the electrical current in a wire. 
• Watts:  Total amount of electrical energy, per second.

The formulae to work them out are: 

• Watts = Volts x Amps 
• Volts = Watts divided by Amps 
• Amps = Watts divided by Volts 

For example: a 20 Watt light bulb in a 12 Volt system:
20 Watts divided by 12 Volts = 1.66 Amps"

Baddie The Pirate is a small website/business that sells "LED lighting for boats. motorhomes, caravans and chicken sheds."