Ncea level 3 electricity - Study guides, Class notes & Summaries

A.C. - Alternating Current Alternating current - An electric current that first moves one direction, then the opposite direction with a regular frequency Ammeter - Device that measures current when connected in series in a circuit Ampere - The rate of flow of charge per second Ampere (Amp) - Unit of electric current. It is equivalent to coulomb/sec. Attraction of Electric Charges - Unlike charges give negative potential energy (attractive force). Unlike charges attract one another. Capac...

Angular Velocity - symbol - ω, units - rads-1 Area - symbol - A, units - m2 Capacitance - symbol - C, units - F Charge - symbol - Q, units - C Charge (Particle) - symbol - q, units - C Current - symbol - I, units - A Dielectric Constant - symbol - εr Distance - symbol - d, units - m Energy - symbol - E, units - J Frequency - symbol - f, units - Hz Impedance - symbol - Z, units - Ω Induced Voltage (EMF) - symbol - ε, units - V Inductance - symbol - L, units - HMagnetic Field Stren...

-ve sign is used to state Lenz law - ε oppose change change in Φ inside loop Additional capacitor in parallel - Like adding more A to the first capacitor so more Q can be stored Alternating current (AC) - Produces V and I that vary with time. Polarity of V and direction of I regularly reverses. Supply f gives no of ω (angular frequency) cycles of this reversal in polarity or direction per sec. ω = 2πf Applying Kirchhoff's Voltage law through a power supply - When moving through a pow...