Energy Technology Practice
10 problems · instant feedback · full explanations
Energy tech is applied physics: efficiency = useful out / total in, power = energy/time, and every conversion loses something to heat.
Q1.
Solar panels generate electricity using which effect?
Multiple choice · Easy
Q2.
A 20% efficient panel receives 1500 W of sunlight. What is the electrical output? (W)
Numerical answer (W) · Medium
Q3.
If wind speed doubles, turbine power output:
Multiple choice · Medium
Q4.
What is the Betz limit — the maximum theoretical wind turbine efficiency? (%)
Numerical answer (%) · Hard
Q5.
Which rechargeable battery has the highest energy density?
Multiple choice · Easy
Q6.
A 100 W bulb burns for 750 hours. How many kWh does it use?
Numerical answer (kWh) · Medium
Q7.
LED bulbs are far more efficient than incandescent bulbs.
True / False · Easy
Q8.
Regenerative braking recovers 100% of a car's kinetic energy.
True / False · Medium
Q9.
A solar farm's actual annual output divided by its theoretical maximum is its:
Multiple choice · Hard
Q10.
The world's largest grid energy storage technology is:
Multiple choice · Hard