2)ELECTRICAL QUANTITIES

VOLTAGES OR POTENTIAL DIFFERENCE

The amount of energy that a generator can be transfer to electrons depends on its voltage(V) or electric tension. This is measured in volts(V).
If we want to meausure the voltage, we can use volmeter. This divice has two wires that must be connected in paralell to the element that we are checking.

MEASURING ELECTRIC CURRENT
Electric current(I) is the change or number of electrons that flow through the cross-section of a conductor every second. We can express this mathematically as flollows:
                                 I=Q/t
Electric current is measured in amperes or amps(A) in the international system.
We can use an ammeter to measure electric current.