How Do I Know What Resistor To Use?

Can I use a higher ohm resistor?

In general, no.

Resistor values are carefully selected by the circuit designer to allow the circuit to work correctly.

While there is some allowable tolerance, it won’t usually be as much as a different value in the series..

What color is a 100 ohm resistor?

100R / 100 ohm Resistor Colour CodeValue100 ΩType4 Band Colour Code SystemColour CodeBrown, Black, Brown, GoldMultiplierBrown, 10ToleranceGold Band ±5%

What are the 4 types of resistors?

The types of resistors include:Carbon Composition Resistor.Thermistor.Wire Wound Resistor.Metal Film Resistor.Carbon Film Resistor.Variable Resistor.Varistor﻿Light Dependent Resistor.

What is tolerance of a resistor?

The tolerance of a resistor is the maximum difference between its actual value and the required value and is generally expressed as a plus or minus percentage value. For example, a 1kΩ ±20% tolerance resistor may have a maximum and minimum resistive value of: Maximum Resistance Value.

What does a 100 ohm resistor do?

The main function of resistors in a circuit is to control the flow of current to other components. Take an LED (light) for example. If too much current flows through an LED it is destroyed. So a resistor is used to limit the current.

What is the purpose of tolerance on a resistor?

Tolerance is the percentage of error in the resistor’s resistance, or how much more or less you can expect a resistor’s actual measured resistance to be from its stated resistance. A gold tolerance band is 5% tolerance, silver is 10%, and no band at all would mean a 20% tolerance.

How do you tell if a resistor is out of tolerance?

If there is no tolerance band, it means that the resistor has an actual value within plus or minus 20 percent of the rated value….For the first and second colored bands, the values are as follows:Black = 0.Brown = 1.Red = 2.Orange = 3.Yellow = 4.Green = 5.Blue = 6.Violet = 7.More items…•

When should I use a resistor?

Electronics All-in-One For DummiesLimiting current: By introducing resistance into a circuit, resistors can limit the amount of current that flows through the circuit. … Dividing voltage: You can also use resistors to reduce voltage to a level that’s appropriate for specific parts of your circuit.More items…

What are resistors used for in real life?

Resistors are used for many purposes. A few examples include delimit electric current, voltage division, heat generation, matching and loading circuits, control gain, and fix time constants. They are commercially available with resistance values over a range of more than nine orders of magnitude.

How do I know what resistor to use with LED?

Determine the voltage and current needed for your LED. We’ll use the following formula to determine the resistor value: Resistor = (Battery Voltage – LED voltage) / desired LED current. For a typical white LED that requires 10mA, powered by 12V the values are: (12-3.4)/. 010=860 ohms.

How do I know what wattage resistor to buy?

Generally speaking the larger their physical size the higher its wattage rating. However, it is always better to select a particular size resistor that is capable of dissipating two or more times the calculated power.

Where do we use resistors?

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.

What is a 1% resistor?

Accuracy, resistance value is within +/- 1% of what you want 2. More values available, With 1% resistors you have more nominal values to work with. … Most times in a circuit it is the ratio of two resistors that matter, not the absolute values. So, the ratio of 2 1% resistors have a 2% accuracy.

What happens if you don’t use a resistor with an LED?

When hooking up an LED, you are always supposed to use a current-limiting resistor to protect the LED from the full voltage. If you hook the LED up directly to the 5 volts without a resistor, the LED will be over-driven, it will be very bright for a while, and then it will burn out.

Do I need a resistor for LED?

Resistors in Light Emitting Diode (LED) Circuits An LED (Light Emitting Diode) emits light when an electric current passes through it. … The ballast resistor is used to limit the current through the LED and to prevent that it burns. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

What resistor do I need for 3v led?

Basics: Picking Resistors for LEDsPower Supply VoltageLED ColorResistor (calculated)3 VRed, Yellow, or Yellow-Green48 Ω4.5 VRed, Yellow, or Yellow-Green36 Ω4.5 VBlue, Green, White, or UV48 Ω5 VBlue, Green, White, or UV68 Ω4 more rows•Aug 29, 2012