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Ampere(s), the unit of electrical current. Current is defined as the amount of charge that flows past a given point, per unit of time. The symbol I is used for current in equations and A is the abbreviation for ampere. Ampere-hour. A measure of charge (or current flow over time).
Alternating currents — The term alternating current refers to a current that reverses at regular recurring intervals of time and that has alternately positive and negative values.
Alternating current (advantages) — As compared with DC, the advantage of AC is the reduced cost of transmission by use of high voltage transformers.
Alternating currents (disadvantages) — As compared with DC, the disadvantages of AC are: The high voltage which renders it dangerous and requires more efficient insulation; alternating current cannot be used for such purposes as electroplating, charging storage batteries, etc.
Alternating current (effects) — There are several effects of the AC to consider in determining the size of wires. Accordingly, allowance must be made for: Self induction, mutual induction, power factor, skin effect, eddy currents, frequency, resistance, electric hysteresis, etc..
Ammeter — Measures the current flow in amperes in a circuit. An ammeter is
connected in series in the circuit.
Ampere — The practical unit of electric current flow. If a one ohm resistance is
connected to a one volt source, one ampere will flow.
Anode — The positive pole of a battery, or preferably the path by which the current passes out and enters the electrolyte on its way to the other pole;
opposed to the cathode.
Branch Circuit — The circuit conductors between the final over current device
protecting the circuit and the outlet(s).
Fuse is a piece of wire of a material with a very low melting point. When a high current flows through the circuit due to Overloading or a short circuit, the wires gets heated and melts. As a result, the circuit is broken and current stops flowing.
IsolatorIsolator is a manually operated mechanical switch which separates a part of the electrical power system normally at off load condition.
Isolator is device which always operate under no load condition . This is because it has no provision for arc quenching.
It's function is to isolate the circuit after operation of circuit breaker and discharge the grapes charges to earth through earth switch.
Also it is very useful in maintenance period.