Everything worth measuring has actually a unit that measurement linked with it. In the US, we usage inches and also feet to measure just how tall other is, pounds and ounces come measure how much something weighs and also Fahrenheit to measure up the temperature the something. But what around electricity? What units of measure or offered to talk about electricity?


Before us talk about how to measure electricity, we first need to know what it is. At a base level, electrical power is the activity of electrons. Your computer, your lights, her television, her fridge, etc all run using the same basic power resource - the motion of electrons.

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Whenever us talk about the strength of electricity, we’re in reality talking around the charge developed by relocating electrons.

The straightforward units of measure up for electrical power are current, voltage and resistance.

Current (I)

Current, measured in amps, is the rate at which fee is flow - how fast the electrons space moving. Amps, or amperes, room the an easy unit because that measuring electricity and also measure how countless electrons relocate past a allude every second. One amp is same to 6.25 x 1018 electrons every second.

Voltage (V)

Voltage, measured in volts, is the distinction in charge in between two points. Put simply, it is the distinction in the concentration of electrons between two points.

Resistance (R)

Resistance is a material’s tendency to withstand the flow of fee (current). That is measured in ohms.

The Water pipe Analogy

Now, let’s put these ideas to work. The most usual analogy used to recognize these ideas is water in a pipe. As soon as thinking around how quick water deserve to move with a pipe, there space three main contents that have to be considered: water pressure, flow rate and pipe size. To combine these two ideas, voltage is tantamount to water pressure, present is the circulation rate and resistance is the pipe size.

So, once we talk about these values, we’re yes, really describing the movement of charge, and also thus, the actions of electrons. A circuit is a closeup of the door loop that enables charge to relocate from one place to another. Contents in the circuit allow us to manage this charge and use the to perform work.

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Ohm’s Law

Ohm’s law is a basic, and also highly important, equation the is used to determine exactly how current, voltage and resistance interact. It claims that the existing is equal to the voltage divided by the resistance or ns = V/R. Ohm’s Law can be supplied to accurately explain the conductivity of many electrically conductive materials. As long as you understand two of the values, it is possible to determine the third. The three variations the this equation are: i = V/R, V=IR, R=V/I



There is another term friend may have heard used in relationship to electricity: Watts. Watt measure the price at which power is supplied or transferred and are not simply used because that electronics. A Watt is the straightforward unit that electric, mechanical, or heat power. One Watt is same to one amp under the press of one volt. (Watt = Amps x Volts)

For a much more in-depth look at voltage, current, resistance, & Ohm"s Law, check out this post.