Is there a way to drop a resistor?
If you want to try to run something off of a higher recommended voltage their are several ways to do it. The simplest is by a Dropping Resistor. This is useful for simple devices and not more complex electronics which should use the appropriate regulated power adapter to get to the correct voltage.
How to calculate the voltage drop on a B + resistor?
Add up all the current draw downstream from your B+ resistor. Determine what voltage you want on the downstream side of the resistor. If you have 350VDC on the upstream side of the resistor, and want 300VDC on the downstream side, the Voltage Drop = 50.
How to know if a resistor needs to be replaced?
If the resistor shows signs of blackening or charring, it may be damaged by excess current flow. A resistor showing blackening or charring should be replaced and discarded. 4 Read the resistor value visually.
How do you measure the resistance of a resistor?
Measure the resistance. Connect the 2 leads of the DMM to the 2 legs of the resistor. Resistors have no polarity, so it does not matter which DMM lead is connected to which resistor leg. Determine the actual resistance of the resistor.
If you want to try to run something off of a higher recommended voltage their are several ways to do it. The simplest is by a Dropping Resistor. This is useful for simple devices and not more complex electronics which should use the appropriate regulated power adapter to get to the correct voltage.
How is the voltage drop across a resistor conserved?
In a parallel circuit, the voltage drop across each resistor will be the same as the power source. Ohm’s Law is conserved because the value of the current flowing through each resistor is different. In a series circuit, the total resistance in the circuit is equal to the sum of each resistor’s resistance.
How to calculate the resistor for an LED circuit?
To calculate the resistor needed for a simple LED circuit, simply take the voltage drop away from the source voltage then apply Ohm’s Law.
What do you need to know about resistors?
You need to know four numbers: the maximum current your device can draw, the minimum current it will draw, the maximum voltage it can withstand without vaporizing into a smelly cloud, and the minimum voltage it needs to function. Without these four numbers, you cannot design a resistive voltage divider.