Circuit Schematics and Breadboard Schematics

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Simple Joule Thief Circuit Schematic

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E(J) = P(W) × t(s)

As far as equations are concerned, it can't get much easier than this. It's even easier than an Ohm's Law calculation. This equation can be found right here. On that site it is stated :

Watts to joules calculation formula

The energy E in joules (J) is equal to the power P in watts (W), times the time period t in seconds (s):
E(J) = P(W) × t(s)
joules = watts × seconds
J = W × s


What is the energy consumption of an electrical circuit that has power consumption of 30 watts for time duration of 3 seconds?
E(J) = 30W × 3s = 90J

So as you can plainly and clearly see, energy is exactly equal to power. This is the same thing as saying that joules are equal to watts, except you just simply have to multiply by time because it takes time for potential energy to flow and become power.


  1. hmmm... why focus on the term "watts" ? same is true for the term "seconds"...
    so one could also state that "energy is exactly equal to time"


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