E lectricity P erhaps the most useful and integral relationship of electricity is the relationship between voltage, current, and resistance in an electrical wire.
Voltage is the difference in electrical charge between any two points.
It can be measured across an appliance or a voltage difference can be created by a battery. Current is the flow of charge through a wire. Finally, the resistance is the amount of attenuation a wire or circuit component applies on a current. The relationship between these three variables is useful in order to understand Alexander Graham Bell's design. Try to determine this relationship using the following questions as guidelines.