CH. 2

Base unit = coulombalso the base unit for current and voltage

Symbol = QAbbreviation = C

Electric current – movement of charged particles in a specific directionElectrons, pos ions, neg ionsSpeed of light (186,000 miles per sec.)

Symbol – I (intensity of the electricity)Unit of current – ampere (amp)

Coulombs per second1A = 1 coulomb/sec

• Direct current– Dc– Current travels in same/one direction– Flashlight cells, and batteries

• Alternating current– Ac– Current periodicallly reverses the direction in

which it is moving– In your house (every 1/120 of a sec)– In tv receiver (every 1/67,000,000 of a sec)

Electric pressure that causes current flowElectromotive force (emf)

Symbol = VTypes of energy

Kinetic energyEnergy in motion, energy doing work, or energy being

converted into another formPotential energy

Energy that can be stored for a long period of time in its present form

Capable of doing work

Opposition a material offers to currentSymbol – RUnit of resistance – omega symbol

Measured in ohmsConverts electric energy into heat energy

when current is forced through a material