What are resistors (with pictures) up electricity bill payment online

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Resistors are electrical devices which manage the flow of current through a circuit, creating a drop in voltage between two k electric jobs points. They are a necessary part of most modern electronics. They rely on something called Ohm’s Law, which maintains that the voltage shift or potential difference between two ends of a conductor is held in proportion to the current moving through the electricity off conductor. As a formula, Ohm’s Law is usually written V=IR, with V representing the voltage, I the current electricity laws physics in amperes, and R the resistor value in ohms.

It is important to recognize that Ohm’s Law is meant to deal with what could be dubbed ideal resistors, such as cannot exist in the real world. Ohm’s Law therefore approximates what happens in reality, but in nearly all cases the approximation is close enough to the true value to be treated as though it were exact. The reason electricity for beginners pdf that resistors in the real world cannot function in perfect accordance with Ohm’s Law is that in any given situation, a range of variables, including outside heat, external gas vs diesel engine distortion, and ambient noise, all minutely affect the flow of current through a resistor.

There are five main types of resistors, each drawn gas city indiana police department differently on a schematic. Fixed-value resistors are represented by a simple zig-zag, variable ones are a zig-zag with an arrowed line through it at a diagonal angle, potentiometers are a zig-zag perpendicular to an arrowed line, thermistors are a zig-zag with a line moving through diagonally and ending in a flat line, and photo resistors are 100 gas vs 10 ethanol represented by two angled and arrowed lines pointing towards a zig-zag. The fixed and variable types have the widest applications, and they electricity for refrigeration heating and air conditioning answer key are seen in most electronic devices.

Fixed resistors are simply basic resistors with a resistor value which cannot be changed. A variable resistor is a simple resistor, but its value may be adjusted by means of a control gasbuddy map. A potentiometer is a type of variable resistor. Thermistors have a variable resistance value which adjusts based on the temperature; they may be used in electronic thermostats and also in many televisions. Photo resistors adjust their resistance based on how much light comes electricity magnetism and electromagnetism into contact with them and are useful for light-activated switches.

The value of a resistor is usually given bp gas prices akron ohio by a series of colored bands on its surface. In most cases, there are four bands of color. The first two bands represent the base-value of the resistance as a two-digit number e 87 gasoline, the third band gives a multiplier, and the fourth band indicates the tolerance. Resistors which require more precision in their value have five bands, with the first three representing the resistance as a three-digit number, and the fourth and fifth lines representing multiplier and tolerance respectively.

So, if a resistor grade 9 electricity unit’s bands are orange-green-orange-gold, then we know that its resistance is 35,000 ohms with a tolerance of plus 4 other gases in the atmosphere or minus 5%. Similarly, if it is banded as brown-red-yellow-brown-blue, we know the resistance is 1,240 ohms with a tolerance of plus or minus 0.25%. More and more frequently these days, these devices have the numerical values given for their resistance and tolerance in addition to, or in place of, the color code. The two above examples would be written as 35k 5% and 1.24k .25%, respectively. Some npower electricity power cut European versions use the ‘k’ instead of a decimal place, rendering the second example instead as 1k24 .25%.