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A resistor is an electrical device that controls the flow of electricity in a circuit. Depending upon the components, there are various types of resistors available in the market. When it is damaged it might generate problems in the circuit and make it stop working. Such defective or short circuited devices should be replaced without delay. Resistor problems give rise to many questions that are asked to electrical experts online. This article provides answers to some of the most commonly asked questions about such problems : Which resistors have orange, white, black and gold stripes? How do I determine how many watts I would require?
In all probability you need a 39 ohms, +/-5% resistor. It is available in most local electrical supply houses or a Radio Shack. If you want to know your wattage requirement you may contact the manufacturer to check the resistor’s input voltage or go through the engineering spec sheet. After that you have to run electricity through the board and check the voltage reading at the resistor location. If two resistors with different resistances are connected in a series what will be the voltage and current of the two components?
The voltage drop would normally correspond to the resistance of each resistor and the voltage from the source. Hence, both components will have different voltage even though the current might be the same. While adding an indicator LED to a 30 volt system what kind of resistor is required to reduce 30 volts to 12 volts at the rate of 1 watt?
Case details: Voltage – ac from solar control leg, power draw on the light – less than 1 watt, single 12 volt LED, light specs - supply 12 volt type-16 volt max / current 12 mA type - 20 mA max.
You will most likely require a 1/2W or greater 1500 ohm resistor. This usually comes in brown, green or red color. Why is an end of line resistor used on an addressable fire alarm system?
This is used for the purpose of monitoring the system and providing a standard resistance to check a short or break. Depending on the make, it varies from 4.7 k to 47 k. A residential dimmer switch was connected to a remote dimmer outlet to electrify blue LED dimmable rope lights. When the dimmer switch was turned off it was found that the lights were still glowing dimly. The other dimmers also have this same problem. How can I fix this problem with the help of a resistor?
This problem can be overcome by a new dimmer which is compatible with magnetic loads. Though they are more expensive, it would be a better option since the circuit is magnetic. However, a biasing resistor would also do. If you do not wish to go for either of the above you may choose a normal two pole switch for hot and neutral before the dimmer to stop the flow of current when it is switched off. Resistors some times burn out just like bulbs do. Both have the same reasons. A sudden power surge, overheating, etc., could be the reasons for the burning out of this device. The ratings of this device are based on the amount of power it dissipates and it is measured in ohms. If the dissipation of power is within the designated range it lasts for a long time. However, a burnt-out resistor should be replaced immediately. If you have any other query about resistor related problems you may ask an electrician to answer your specific questions.
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