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1.electric current is expressed in the unit called ampere or I = Q/t. 2.an electric current is the flow of charged electrons from the region of higher concentration to the region of the lower concentration 3the function of the switch is to on and off the circuit
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1)expression for electric current:
v-potential difference

2)it is the amount of flow of electic charge through a unit cross sectional area

3)the switch is used to open or close the circuit
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