CH. 2

Base unit = coulomb also the base unit for current and voltage Symbol = Q Abbreviation = C

Electric current – movement of charged particles in a specific direction Electrons, pos ions, neg ions Speed of light (186,000 miles per sec.) Symbol – I (intensity of the electricity) Unit of current – ampere (amp) Coulombs per second 1A = 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 flow Electromotive force (emf) Symbol = V Types of energy Kinetic energy Energy in motion, energy doing work, or energy being converted into another form Potential 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 current Symbol – R Unit of resistance – omega symbol Measured in ohms Converts electric energy into heat energy when current is forced through a material