Final answer:
The letter Q represents electrical charge, with the SI unit of charge being the coulomb (C). A farad is actually a unit of capacitance and not of charge. Therefore, the correct symbol for measuring electrical charge is C. Coulomb.
Step-by-step explanation:
The letter Q symbolizes electrical charge, and the SI unit of charge is the coulomb (C). The coulomb is used to measure the amount of electric charge, where 1.00 C is equivalent to the charge of approximately 6.25 × 1018 protons or the combined charge of the same number of electrons. On the other hand, the unit of capacitance is the farad (F), which is defined as a coulomb per volt. This unit is named after Michael Faraday, an English scientist known for his contributions to electromagnetism and electrochemistry.
The smallest observed bit of charge is from the proton (with a charge of +1.6 × 10−19 C) or the electron (with a charge of −1.6 × 10−19 C), and all observed charges are integral multiples of this elemental charge. Note that farad, being related to capacitance, is not a unit for electric charge. Therefore, the correct answer is C. Coulomb.