NCEA Level 3 Electricity Questions with 100% Correct Answers

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. Capacitance - Measure of a capacitor's ability to store charge, calculated by the ratio of the magnitude of charge on one plate to the voltage across the two plates, expressed in SI units, farads. Capacitators - Stores electrical energy as an electric field. Capacitor - Device that stores electric charge on two oppositely charged plates Cell - Positive to negative terminal (opposites) Charging - When a capacitor gains a charge causing a potential difference across its plates Circuit - Conducting path from to positive terminal of a power source to the negative terminal of a power sourceCircuit diagram - Diagram using symbols to represent an electrical circuit Coil - Turns of electric wire around an object(e.g. Iron core) Conductors - Materials that allow electric charges to flow through them easily Conventional Current - Current flows from positive to negative terminal Coulomb - Unit used to measure quantity of electric charge Current - A flow of electricity through a conductor Dielectric constant - Proportion by which the capacitance increases when an insulator is placed between the plates of a capacitor Direct current - An electrical current that always moves in one direction Discharging - When a capacitor loses a charge causing a potential difference across its plates Electric Field - The field around charged particles that exerts a force on other charged particles. Electric potential energy - Potential energy due to the position of an electrical charge near other charges Electrical conductors - Materials that have electrons that are free to move throughout the material; for example, metalsElectrical energy - A form of energy from electromagnetic interactions; one of five forms of energy-Mechanical, chemical, radiant, electrical, and nuclear