✔ 最佳答案
Electric current:
When the metal wire is connected to a dry cell in a closed circuit, the free electrons are driven to movein the same direction by the dry cell. The flow df thesefree electronsforms an electric.current.
An ammeter is used to measure the size of an electric current
the unit is ampere(A)
Voltage:
A dry cell drives electrons to flpw though a circuit in a definite direction because it provides a voltage.
Voltmeter is used to measure voltage
the unit is volt(V)