Ohm’s Law, Power, and Energy (Topic 1) in Module 2 – Solar-PV-NABCEP-Associate (BG)

Ohm’s Law, Power, and Energy

Most PV electrical calculations boil down to a small set of relationships:

• Ohm’s law: $V = I × R$
• Power: $P = V × I$
• Energy: $E = P × t$ (commonly in watt-hours or kilowatt-hours)

Units

• Voltage (V)
• Current (A)
• Resistance (Ω)
• Power (W)
• Energy (Wh, kWh)

The exam often checks whether you can rearrange these formulas and keep track of units.