Source of voltage to push current through a circuit.
Consist of two or more cells in which a chemical reaction provides energy to electrons in conductors (electrodes) that are immersed in the chemicals (electrolytes) in cells.
Supplies electrical current.
Some call it the battery, but techniquely a battery has more then 1 cell.
Componant that accumulates & opposes charges in voltage, storing electrical energy in an electric field.
The letter F denotes capacitance, which is measued in farads.
Two metal plates or curved surfaces close together that are seperated by an insulator make up a capacitor.
Two types of capacitor are polarized capacitors (connected the correct way in circuit) & variable capacitors (often used in radio tuning circuits).
Semiconductor componant that allows current to flow in only one direction.
Used to convert AC current to DC. Known as electical version of a valve (early diode).
Light-emitting diodes (LEDs) emit light when an electric current passes through them.
Safety devicethat blows (melts) if the current flowing through exceeds a specific value.
Consist of a strip or coil of metal with a low melting temperature.
Common voltage reference level defined by the container of electric circuit (chassis ground) or by the earth.
Device that opposes changes in the flow of current, storing electrical energy in a magnetic field.
The letter L denotes inductance, which is measued in henries.
Usually consist of a coil of wire, sometimes wrapped around a piece of iron (iron core) or an insulating shell (air core).
Componant that opposes changes in the flow of current, transformimg electrical energy to heat.
The letter R denotes resistence, which is measued in ohms.
Define:Resistor (Nonvariable) Color Code
Restrict the flow of electric current.
Types of variable resistors include
Rheostat:resistor with two contacts, usually used to control current. Example: Light brightness & motor speed.
Potentiometor:Resistor with three contacts, used to control voltage.
Preset variable resistors:device that operates with a small screwdriver or similar tool. Designed to be set with circuit & made and left without further adjustment.
Device that interrupts or allows the flow of current in a curcuit.
Name 6 types of switch & what they are used for?
Push switch:allows current to flow only when button is pressed, i/e/:doorbell.
Push-to-break switch:circuit is normally closed (device on), & the curcuit is open (device off) only when button id pressed.
On/off switch:allows current to flow only if it in a closed(on) position.
Two way switch:directs the flow of current to one of two routes, according to its position.
Dual on/off switch:often used to switch main electricity because it can isolate both the live & neutral connections.
Relay switch:electrically operated switch that may operate multiple switches at one time. Current flows through a coil sets up a megnetic field, which causes the lever(s) to move, effectively changing the relay switchs position.
Componant that controls the flow of current between the emitter (voltage output (e))& collector (voltage input (c)) by the voltage applied to the base (acts like a gate, voltage flow through the transistor (b)).
Complex current (not a electronic component), used to magify power, current, or voltage.
Device designed to receive &/or transmit radio signals.
Power supply provides direct current which alwaysflow in one direction.
Power supply provides alternating current which constantly changes direction at a specfic frequency.
Used to pass current from one part of the component to another.
Consist of two coils of wires linked by an iron core.
Used to step up (increase) & step down (decrese) AC voltages.
No electrical connection exists between the coils.
Energy is transferred between the coils by the magnetic field in the core.