SI Units for Electric Current

What is the base unit for electric current in the SI system?

• ampere

• watt

• ohm

• volt

Who is the unit of electric current named after?

• Ampere

• Watt

• Joule

• Ohm

What is the symbol for the base unit of electric current?

• A

• D

• B

• C

What is the definition of 1 ampere?

• The force between two parallel conductors of infinite length and negligible cross-section placed 1 meter apart in a vacuum

• The potential difference between two points in a conductor when 1 joule of work is done to move 1 coulomb of charge between the two points

• The amount of electric charge that flows past a given point in a circuit in 1 second

• The constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in a vacuum, would produce between these conductors a force equal to 2 x 10^-7 newton per meter of length.

What instrument is used to measure electric current?

• Barometer

• Voltmeter

• Ammeter

• Thermometer