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# Why does my blower motor turn on and off?

## Why does my blower motor turn on and off?

If your blower is constantly turning on/off when the furnace isn’t heating… …you most likely have a bad fan limit switch. The system uses a “temperature probe” to detect temperature changes inside the heat exchanger (see image below) and turns your blower on and off in response.

## What happens if you put too much voltage through an LED?

First off, an LED is a current driven device, not a voltage driven device. That is, it doesn’t really care what the voltage is, but it does care what the current is. Of course, too much voltage will kill it – but too much current, regardless of the voltage, will kill it.

## Can I connect a LED directly to a battery?

Never connect an LED directly to a battery or power supply because the LED is likely to be destroyed by excessive current passing through it. resistor is suitable for most LEDs if your supply voltage is 12V or less.

## What resistor should I use with my LED?

LEDs typically require 10 to 20mA, the datasheet for the LED will detail this along with the forward voltage drop. For example an ultra bright blue LED with a 9V battery has a forward voltage of 3.2V and typical current of 20mA. So the resistor needs to be 290 ohms or as close as is available.

## What happens when an LED is directly connected to a power supply?

When the LED is directly connected to power (AC – Altering Current), it burns. The optimal voltage and current required for an LED in 2–3 Volts and 10–30mA (12–20mA is the most common range)respectively. The output of an AC is much higher than the operational power of an LED. Therefore it burns.

## Do I need a resistor for LED?

An LED (Light Emitting Diode) emits light when an electric current passes through it. The simplest circuit to power an LED is a voltage source with a resistor and an LED in series. Such a resistor is often called a ballast resistor. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

## Do I need a resistor for a 12V LED?

1 Answer. AFAIK there is no, or at least no common, led diode that is typically 12V forward voltage by it self. 12V led are modules that consist of some combination of diodes and resistors to make them suitable for 12V power applications without needing extra current limiting.

## What happens when an LED is directly connected to a power supply which is the most suitable value of resistor if a power supply of 0 12 V is used?

The forward voltage of an LED is between 1.8 and 3.3 volts, So connecting them directly to a 9 Volt battery without a current limiting resistor will just destroy them, UNLESS it is connected in ‘Reverse bias’ mode.

## What do the colors on a resistor mean?

Most resistors have four stripes of color. The first three stripes indicate the resistance value, and the fourth stripe indicates the tolerance. Some resistors have five stripes of color, with four representing the resistance value and the last one the tolerance.

## What color is a 100 ohm resistor?

100R / 100 ohm Resistor Colour Code

Value 100 Ω
Type 4 Band Colour Code System
Colour Code Brown, Black, Brown, Gold
Multiplier Brown, 10
Tolerance Gold Band ±5%

## Does the color of a resistor matter?

The beige-colored body of a resistor is often an indication that its tolerance is 5%, while a blue-colored body often indicates a tolerance of 1% or 2%. The blue-bodied resistors and the dark brown resistor contain metal-oxide film elements, while the beige-bodied resistors and the green resistor contain carbon film.

## What does the tolerance of a resistor mean?

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.

## Is it possible to have a resistor with no tolerance value?

Resistors with tolerances lower than 2% are called precision resistors with the or lower tolerance resistors being more expensive. If resistor has no fourth tolerance band then the default tolerance would be at 20%.

## How do you know if a resistor is tolerance?

The “tolerance” is how close that resistor should be to the marked value. Say you have a 100 Ohm, 5% resistor. It should be between 95 and 105 Ohms. If you need more “precision”, a 1% resistor would be between 99 and 101 ohms.

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