## What is the purpose of resistor to ground?

The resistor to ground (1 Meg) prevents the input from floating whenever no input is connected. It also sets the input impedance, which typically is desired to be be fairly high relative to the source impedance. The 10K is a current limit to the input.

## Why do you need a resistor when connecting an LED in a circuit?

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 excess current that can burn out the LED. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

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Why do you have to place a resistor after the LED?

If the LED gets too much current flowing through it, it will burn out and die. So it always needs a resistor to protect it.

### What is the purpose of resistor?

A resistor is a passive electrical component with the primary function to limit the flow of electric current.

### What is pull-up resistor in Arduino?

Pull-up resistors are fixed value resistors used between the connection of a voltage supply and a particular pin in a digital logic circuit. More commonly paired with switches, its purpose is to ensure the voltage between Ground and Vcc is actively controlled when the switch is open.

Why pull up resistors are used in I2C?

Why is a pull-up resistor used in I2C? Because there are only 2 logic level outputs from I2C, Low and open circuit. The default condition is all chips on the line are in open circuit mode, and the pull-up resistor makes the line high. The master chip can send an address signal to one of the chips on the line.

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## Why do we use resistor when an LED is connected to controller * 1 point?

The resistor’s purpose is to limit current and thus uses some amount of power. The resistor has a voltage drop and so does the LED. So, according to Kirchoff’s Voltage Law: If you solve for the voltage drop of the resistor, you get 8.1V.

## How to connect led sensors to Arduino?

Step 1: Place the LED sensor in the breadboard Step 2: Connect its one pin to A0 (analog pin) of Arduino, and connect its pin to GND pin of Arduino. Step 3: Place another LED on a breadboard and connect a 220-ohm resistor to its Anode. Step 4: Connect a wire from the resistor to pin 13 on Arduino (digital pin).

What happens if you plug an led into a resistor?

The resistor of an LED is extremely small in the direction shown in the figure (the long pin of the LED connected to the 5V side and the short pin connected to the GND side). According to Ohm’s Law: I = V/R, the current flowing through the LED would be extremely large, which will burn your LED.

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### Why do I need a resistor on the ground side?

You need a resistor for each to keep the brightness the same. If you only used one resistor on the ground side then all three LED’s would be sharing the same reduced current meaning that if only one was on it would be much brighter then if all three were on. – Chad G Feb 22 ’18 at 16:07

### How many resistors do I need to power my Arduino?

You don’t want to pull that much current from the Arduino so using 220 resistors is a safe bet at 22mA current draw per leg. That 10K resistor keeps pin #2 at the ground potential until the button is pushed. Then the input to pin #2 is 5 Volts. FWIW – that is an ugly drawing.