How do you know which is right and left on a resistor

Through-holeВ resistors come with long, pliable leads which can be stuck into aВ breadboardВ or hand-soldered into a prototyping board orВ printed circuit board (PCB). These types of resistors are usually abbreviated as either PTH (plated through-hole) or SMD/SMT (surface-mount technology or device). Resistors will come in one of two termination-types: through-hole or surface-mount. They might be a standard, static resistor, a pack of resistors, or a special variable resistor. They might be through-hole or surface-mount. Resistors come in a variety of shapes and sizes. Another resistor (R3) limits the current through an LED. In this circuit, resistors play a key role in setting the frequency of the 555 timerвЂ™s output. For example, hereвЂ™s a few resistors in action on a 555 timer circuit: Each resistor in a circuit should have a unique name/number. The name of the resistor is usually an RВ preceding a number. The value, displayed in ohms, is obviously critical for both evaluating and actually constructing the circuit.

The resistor circuit symbols are usually enhanced with both a resistance value and a name. Those are what connect to the rest of the circuit. The terminals of the resistor are each of the lines extending from the squiggle (or rectangle). R1 is an American-style 1kО© resistor, and R2 is an international-style 47kО© resistor. When modeled on a schematic, a resistor will show up as one of these two symbols: Schematic symbolДЄll resistors have two terminals, one connection on each end of the resistor. For example, a 4,700О© resistor is equivalent to a 4.7kО© resistor, and a 5,600,000О© resistor can be written as 5,600kО© or (more commonly as) 5.6MО©. ItвЂ™s very common to see resistors in the kilohm (kО©) and megaohm (MО©) range (much less common to see miliohm (mО©) resistors).

The (somewhat roundabout) definition of 1О© is the resistance between two points where 1 volt (1V) of applied potential energy will push 1 ampere (1A) of current.ДЄsВ SI unitsВ go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. The symbol for an ohm is the greek capital-omega: О©. The electrical resistance of a resistor is measured in ohms. Commonly resistors are used to limit current,В divide voltages, andВ pull-up I/O lines. Resistors are usually added to circuits where they complement activeВ components like op-amps, microcontrollers, and otherВ integrated circuits. They are passiveВ components, meaning they only consume power (and canвЂ™t generate it). The resistorвЂ™s resistance limits the flow of electronsВ through a circuit. Resistors are electronic components which have a specific, never-changingВ electrical resistance.

How do you know which is right and left on a resistor