What is the charge of a proton in coulombs?

Answer: 

The coulomb, commonly abbreviated ‘C,’ is the SI unit for electric charge. A coulomb is the amount of charge produced by a one-ampere current running for one second. A coulomb is the charge on 6.241 x 10¹⁸ protons. 1 proton has a charge of 1.6 x 10^-19 C. An electron’s charge, on the other hand, is -1.6 x 10^-19 C. A coulomb is a massive charge; two 1 C charges separated by 1 m exert a force of 9 x 10⁹ newtons (see Coulomb’s law). That’s more than two million tonnes, or 720 times the thrust of a space shuttle solid rocket booster during launch.