 Let's talk about electricity and you're all familiar with terms like voltage. This is a hundred ten volt appliance Power like this is a thousand five hundred watt microwave or even current This appliance uses 10 amperes or this fuse Will blow at 20 amperes But what do these terms actually mean and what is this electricity? So let's go one by one. Let's start with the electric current The electric current is simply the amount of charge that travels through wire per second So how many charge is traveling per second? So Coulomb per second Which gives us the unit on pair You compare you could compare this with the river Where this would be the amount of water per second that flows down the river or goes over a waterfall The next thing is the electric potential also called the voltage Its unit is volts Hence why we call it sometimes also the voltage What is the voltage? Well the voltage is the energy pair charge that Unit charge will encounter when it travels from one end of the wire to the Otter if you think of this with the waterfall again a change of energy in this case would be the potential a Gravitational energy from falling down So the higher the waterfall the more potential energy each molecule of water or each kilogram If we do the real analogy of what I would have at the top now with the Electricity it is not gravity that pulls the electron from one side to the other, but the electrostatic force so We would have the electric potential energy divided by the Coulomb so her Coulomb how many choose of? Potential electric energy do we have so this is What the? Electric potential or the voltage is now. Let's go to power you already know power from mechanics as the change of energy pair time and Now what we can do is you can take our equations from the current Being Coulomb per second how much charge per time so if there's some for time and put it at the bottom And we can use that the voltage is change of energy Her charge so Choules her Coulomb you can combine this and what we come up with is that the power for an electric device is Simply the current times the voltage on which it operates So let's do a little example So let's say we have a thousand five hundred watt microwave that operates at hundred ten voltage 1500 watts 110 volts you want to know how many amperes Go through the microwave for example to see if our fuse will be able to hold it or if it will blow immediately so power is Voltage times current Therefore if we're selling for current, this is power over voltage. So we have thousand five hundred What over 110 volt? gives me Around 14 amperes