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Single Pole Single Throw Switch |
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Two Inputs one output for each circuit |
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closes circuit when pushed. returns to open (off) position |
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Toggle Switches limited by: |
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No more than 2 throws, current limited by physical size |
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Momentary contact switches |
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used for limit switches e.g. landing gear |
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Fixed core devices, LOW power |
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Movable core devices: heavy duty |
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Solenoids can be used to: |
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Control mechanical action |
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Reduce current flow in a circuit, Convert elec. energy to heat |
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Store elect. energy: made up of metal plates which can store energy |
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Capacitance is measured in: |
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Used to increase voltage in an AC Circuit: TWO coils (wall warts) |
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small mass, NEGATIVELY charged |
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Positively charged, center of atom relatively large mass |
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neutral charge same mass as proton |
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an atom with an excess or deficiency of electrons |
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number of chemical bonds that can form in an atom Determines if conductor or insulator |
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copper, gold, silver Nearly EMPTY outer orbit |
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No room for free electrons: Plastic air glass |
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Half outer orbit full: Silicon, arsenic |
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a method to remove insulation from a wire |
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How many nicks or broken strands are acceptable when stripping wire |
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Joins two or more metals by melting and flowing a filler into the joint. |
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A mixture of copper and tin- ratio varies |
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An agent used to prevent oxidization in the solder |
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Electrical pressure: VOLTS: Electromotive force |
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The location of the positive connection compared to the negative connection |
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Current flows in one direction- linear |
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The polarity constantly changes- flows in one direction and REVERSES |
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How often the current reverses, constant per system Measured in Hertz (HZ) |
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Stationary sources of power produce: |
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Brushless motors can be used with: |
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Aircraft engines are started with: |
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Three phase systems produce: |
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6.28 BILLION ELECTRONS: the current that will pass through a silver nitrate solution and will cause .0011 milligrams of silver to deposit on an electrode. |
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inversely proportional to current flow |
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A material that attracts ferrous metals |
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two poles (North and South) |
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Almost constant magnetic field |
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The magnetic field changes under certain circumstances |
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The field of force existing between the poles of a magnet. called magnetic FLUX- has poles |
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The process of producing a magnetic field using an electric current. used in Relays, solenoids, motors |
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Polarity of a magnetic field is determined by: |
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Direction of current flow |
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Strength of a magnetic field is determined by: |
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STRENGTH of current, number of turns of the coi |
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Electromagnetic induction: |
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When an electrical voltage/current produces magnetic fields and motion |
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3 elements required for electromagnetic induction |
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1: conductor 2:Magnetic Field 3: Motion between magnetic field and conductor |
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Left hand rule for generators: |
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determines voltage polarity of electrical power. - direction of current flow |
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Factors influence amount of voltage/current |
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strength of magnetic field, number of coils: speed of motion between coils and magnet |
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one or more electromechanical cells that convert stored chemical energy into electrical energy: |
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Invented in 1800 called voltaic pile by Alesssandro Volta |
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The net voltage of any cell is determined by: |
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chemical structure of the electrodes |
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Not rechargeable, higher energy density- alkaline |
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rechargeable: lower energy density: good for high loads |
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liquid electrolyte covers all internal parts: gasses are produced |
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electrolyte is more of a paste, e.g zinc-carbon |
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anode(negative)- zinc cathode(positive)-carbon electrolyte is ammonium chloride {1.5 volts} |
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Low maintenance lead-acid battery doesn't need water ALSO called VERLA (valve regulated lead acid battery) |
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sealed lead-acid batteries: |
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Most aircraft batteries are: |
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