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HeatSpring PV Course Blog

Voltage Drop and Ohm's Law

From HeatSpring.com PV Boot Camp Discussion Board

Q:

I understand that resistance is a constant since it is tied to a material's properties, but you said that Ohms Law measures voltage drop or loss and I don't see that in the law.

A:

Ohm's law states:
V = I x R

The V is going to be the voltage drop and not the system voltage.

Example:

If we have 2A, a 3 Ohm wire and a 100V system, then:

Vdrop = I x R
Vdrop = 2A x 3 Ohms = 6 Volts

Then if we want to figure out voltage drop percentage:

6 volts of voltage drop / 100V system = 6% voltage drop.

Let me know if you need more.

Thanks,
Sean


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