Model JO415 DC microammeter is suitable for students to measure weak current and slimelectric potenial in laboratory of middle school and polytechnic school.
And the electrical potential for the whole reaction, called the standard cell potential, is just the sum of the standard potentials of both half reactions.
And this drop in potential energy, divided by the test charge's magnitude, gives us the electric potential energy difference per unit charge, also known as the electric potential.