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Medalcraft
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I need to create a dummy load on a 120VAC circuit. The load must draw .3A. How can I do this?
No it wasn't powerfull enough.Medalcraft said:I tried a different resistor that was here, 1K and it must have been bad (magic smoke).
vk6kro said:If 0.33 amps would be OK, you could use a 120 volt 40 watt lamp bulb.
Power = voltage * current
so current (in amps) = power (in watts) / voltage
Current = 40 watts / 120 volts = 0.33 amps.
Medalcraft said:I need to create a dummy load on a 120VAC circuit. The load must draw .3A. How can I do this?
Well that 'cold' low resistance holds for only ~.1 seconds, after that time rated current and wattage is expected. So yes there will be a ~10X startup current for the OP, then quickly settling to 0.3 A and staying there absent extreme ambient conditions.sophiecentaur said:The only snag with using light bulbs is that you can't be certain of their resistance at anything other than their normal operating temperature. The resistance varies over a range of ten to one from hot to cold. You may need to experiment a bit and even use two in series (one high wattage and one low wattage) to get the resistance you want - if its value is critical. You can also buy very low wattage heaters which don't operate at white heat and will have more stable resistance values.
A dummy load is a device that simulates an electrical load in order to test or calibrate electronic equipment. It is typically a resistor or a combination of resistors that can dissipate a specific amount of power.
Creating a dummy load is necessary for testing electronic equipment, such as power supplies or amplifiers, without risking damage to the equipment. It allows for controlled and safe testing of the equipment's capabilities.
To create a dummy load, you will need to select the appropriate resistors based on the amount of power you need to dissipate. Then, connect the resistors in parallel to create a load with the desired resistance. The resistors should also be able to handle the amount of power you will be testing.
No, not all resistors are suitable for creating a dummy load. It is important to carefully select resistors that can handle the amount of power you will be testing and have the appropriate resistance value. High-wattage, wire-wound resistors are typically recommended for creating a dummy load.
Yes, it is important to follow safety precautions when using a dummy load. Make sure the resistors are properly rated for the power being dissipated and that they are connected correctly. Also, be mindful of heat dissipation and do not touch the resistors while they are in use. Always use caution and follow proper safety procedures when working with electricity.