21. The burning of fossil fuels does not release?
Ans: Potential energy
22. Geothermal energy is…………..?
Ans: Generated in rocks below the Earth’s surface
23. Humans get their own energy from?
Ans : Foods
24. A sine wave voltage is applied across a capacitor. When the frequency of the voltage is decreased, the current?
Ans: decreases
25. When the voltage across a capacitor is tripled, the stored charge
Ans : Triples