Power Grid quiz

More questions about Power Grid

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Why do some power lines carry big orange balls?

   Answer: To warn aircraft

   Why: US aviation rules call for them where lines cross canyons, lakes or rivers and near airports, where planes fly low.

2. 2 Medium

   What does standard rooftop solar without a battery do in a blackout?

   Answer: Shuts down

   Why: Anti-islanding rules switch the inverter off so it cannot energize lines that repair crews expect to be dead.

3. 3 Hard

   How many hertz is a substation's hum on a 50 Hz grid?

   Answer: 100 Hz

   Why: The steel core stretches and shrinks with every peak of the magnetic field, and the field peaks twice in each cycle.

4. 4 Easy

   Which frequency does Europe's grid run at?

   Answer: 50 Hz

   Why: Most of the Americas run at 60 Hz instead, and Japan is split, with 50 Hz in the east and 60 Hz in the west.

5. 5 Medium

   Why did some European oven clocks lose 6 minutes in 2018?

   Answer: Low grid frequency

   Why: These clocks keep time by counting the grid's 50 cycles a second, so a frequency slightly below 50 Hz makes them run slow.

6. 6 Hard

   How do a line's losses change if voltage doubles at equal power?

   Answer: Drop to a quarter

   Why: Losses equal current squared times resistance, and doubling the voltage halves the current needed for the same power.