Its been some time so i might be wrong but i think the answer is 3 either or 2
Most likely analog signal.
a capacitor, transistor and resistor are only devices used in an electrical circuit. Chaging current or voltage doesn't create devices out of thin air.
Answer:
Radiation
Explanation:
Radiation refers to the emission of energy in rays or waves
Kilograms
The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM)
Hope this helps!