How do I know what wattage resistor I need?

Resistor Power (P)

[ P = V x I ] Power = Volts x Amps.
[ P = I2 x R ] Power = Current2 x Ohms.
[ P = V2 ÷ R ] Power = Volts2 ÷ Ohms.

How do you calculate the power consumed by a resistor in series?

Power can also be calculated using either P = IV or P=V2R P = V 2 R , where V is the voltage drop across the resistor (not the full voltage of the source).

How many watts can a resistor take?

The more watts a resistor can handle, the larger and more expensive the resistor is. Most resistors are designed to handle 1/8 W or 1/4 W. You can also find resistors rated for 1/2 W or 1 W, but they’re rarely needed in the hobbiest types of electronic projects.

How many watts is a 1K resistor?

Resistor 1K Ohm 1/4th Watt PTH – 20 pack. These are 1/4th Watt, +/- 5% tolerance PTH resistors. Commonly used in breadboards and perf boards, these 1K Ohm resistors make excellent pull-ups, pull-downs, and current limiters.

How do you calculate the size of a resistor?

To calculate the size resistor we need to use a relay that operates at a lower voltage than that output by our RC car controller we use Ohm’s Law. Resistance (“R” in Ohms) = Voltage Difference (“V” in volts) divided by Current (“I” in amps). Resistors are sold by: Wattage, Tolerance and Ohms.

How do I calculate wattage?

The formula for calculating wattage is: W (joules per second) = V (joules per coulomb) x A (coulombs per second) where W is watts, V is volts, and A is amperes of current. In practical terms, wattage is the power produced or used per second. For example, a 60-watt light bulb uses 60 joules per second.

Do you 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. If the voltage source is equal to the voltage drop of the LED, no resistor is required.

How many watts does my PC use?

A complete desktop uses an average of 200 Watt hours (Wh). This is the sum of the average consumption per hour of the computer itself (171 W), the internet modem (10 W), the printer (5 W) and the loudspeakers (20 W). Assuming that a computer is on for eight hours a day, the annual consumption comes to 600 kWh.

What is the formula for calculating resistor wattage?

I need the formula for calculating resistor wattage when the resistors are in series. For example, say I have 3 1/4 watt 10 ohm resistors in series. What is the potential power dissipation for the entire circuit?

How to calculate the wattage of a generator?

Electric Generators Direct put together this easy-to-use Portable Generator Wattage Calculator to make it simple to pick the perfect size. Simply fill out the details of your home and the watt calculator will do the work for you by suggesting the right portable generator size.

How do you calculate the total series resistance?

Use the series resistor calculator to calculate the total series resistance. Formula: R T = R1 + R2 + R3 + etc..

How to find power dissipation on a resistor?

In this case, enter any two of the following values: the voltage across the resistor, the current through the resistor, or its resistance in ohms to find the power dissipation in watts. This is the minimum power rating you can use on your resistor. Our calculator rounds up to the nearest value to ensure minimum safety.

How do I know what wattage resistor I need? Resistor Power (P) [ P = V x I ] Power = Volts x Amps. [ P = I2 x R ] Power = Current2 x Ohms. [ P = V2 ÷ R ] Power = Volts2 ÷ Ohms. How do you calculate the power consumed…