In this blog post, we will examine how the current through a circuit changes when a switch is closed. This change in current can be used to calculate voltage and power losses due to resistance. We’ll show you how to use Ohm’s law and Kirchhoff’s Laws for these calculations.

In this example, a circuit has the following values:

-R = 100 Ω -V= 12 V.

flash, tesla coil, experiment @ Pixabay

In order to calculate power losses due to resistance, we need current and voltage values. As such, when we say “current,” what we really mean is “voltage (through) the resistor.”

We can see that in this case voltage across R is 12 volts while the current through it is 0 amps because there’s no path for electrons to flow once the switch is closed.

Now if our calculation of watts were based on milliwatts instead of megawatts as shown below, then wattages would be calculated differently. Now that you know how Ohm’s law works with currents and resistances.

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