✓ TradeExamPro

TradeExamPro › Electrician › Solar PV fundamentals

Fundamentals practice questions

25 questions from the solar pv fundamentals practice test.

Fundamentals practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

What this covers

Sample questions

A 24 V battery is connected to a 6 ohm resistive load. How much current flows?

  1. 144 A
  2. 4 A
  3. 0.25 A
  4. 30 A
Show the answer

B. 4 A

Ohm's law gives current as voltage divided by resistance: 24 V ÷ 6 Ω = 4 A. Multiplying the two (144) is the common slip, and 0.25 comes from dividing resistance by voltage.

Reference: Ohm's law: I = E / R

An inverter delivers 30 A at 240 V to a panelboard. What is its output power?

  1. 8 W
  2. 270 W
  3. 3,600 W
  4. 7,200 W
Show the answer

D. 7,200 W

Power is voltage times current: 240 V × 30 A = 7,200 W. Dividing voltage by current (8) gives a resistance, not a power, and 3,600 W uses 120 V instead of the stated 240 V.

Reference: Power formula: P = E × I

A 300 W module operates at its full rated power for 5 hours. How much energy does it produce?

  1. 60 kWh
  2. 1,500 kWh
  3. 1.5 kWh
  4. 0.06 kWh
Show the answer

C. 1.5 kWh

Energy is power times time: 300 W × 5 h = 1,500 Wh, which is 1.5 kWh. Leaving the answer in watt-hours but labelling it kilowatt-hours gives the tempting 1,500 kWh.

Reference: Energy formula: E = P × t

Other topics