Ohm's Law

  Ohm's law is the foundational law for circuits, much like Newton's laws of motion were foundational for classical mechanics.  The idea behind Ohm's law is in order to create a current I we need two this a voltage (a power source) and a resistor which connects the voltages.  It is important to mention that current is a result of the voltage and resistors.  Ohm's law states thats Current is equally dependent on Voltage and Resistance. 

What is ampere

   Amperage, also called current, is the amount of electrical energy flowing through an appliance at any given time. This measurement is expressed in units called amperes, often shortened to amps. When electricians speak of the electricity flowing in and out of your home, they may be referring to voltage, amperage or wattage depending on the circumstances. Of the three, amperage is the one you may experience first when you plug in a faulty lamp or flip the wrong switch.

What is a Voltage

 The batteries we use in flashlights and clock radios operate on chemical energy. This chemical energy—which you may learn more about in chemistry class—separates charges, creating a potential difference. To separate charges and create a positive and negative terminal, the battery must do a certain amount of work on the charges. This work per unit charge is called the voltage, V, or electromotive force, emf, and is measured in volts (V). Remember, one volt is equal to one joule per coulomb.

Definition provided by Spark notes