Contents
What happens if the resistor is too high?
For a simple LED circuit there are no bad consequences of using a resistor of higher power. On the other hand, some type of high speed communication system may not like the increased capacitance to ground of a large resistor or, the increased series inductance.
Do I need a resistor with my 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. If the voltage source is equal to the voltage drop of the LED, no resistor is required.
How to choose the right resistor for your circuit?
How do I Choose the Right Resistor? 1 Step 1 – Calculating Your Resistance. This is where you will use Ohm’s Law to calculate your resistance. You can use one of the standard formulas 2 Step 2 – Calculating Your Power Rating. 3 Step 3 – Choosing a Resistor.
Are there high power ceramic resistors water proof?
No they are not water proof. Three things you could do. You could seal them, but since the good Dr. Fried Parts says the power ratings should be halved, you might need to double up on each resistor. Or you can mount them in a automotive rated case, like under the hood car fuse boxes are.
What should the resistive value of a pull up resistor be?
Reducing the resistive value further, will produce a smaller voltage drop but increase the current. Then we can see that while there may be a maximum allowable resistive value, the resistance value for pull-up resistors is not usually that critical with resistance values ranging from between 10k to 100k ohms acceptable.
How to find the voltage drop of a resistor?
We first need to find the voltage drop of the resistor, which is 9V from the battery and 2V from the LED, so: 9V – 2V = 7V You can then plug in all of this information into your formula: P = 7V*7V / 350 Ohm = 0.14 Watts