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The power dissipated by a resistor is E2/R .
If the "25volt" is the potential difference (voltage) between the ends of
the resistor, then the resistor dissipates
E2/R = (25)2/10 = 62.5 watts .
That's quite a fair amount of power ... more than you could expect to dissipate
from a typical carbon composition resistor. This particular resistor is something
like a heating coil in a toaster or a large acquarium, for example.
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∙ 10y ago
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What is the current of a 25volt resistor?
Resistors are rated in ohms for their resistance value and in watts for the power they are capable of handling. They are not rated in volts or current.
What is the current 1 if the voltage is 100volts and the resistor is 10ohms?
Ohm's Law: Current is voltage divided by resistance.100 volts divided by 10 ohms is 10 amperes.This is also 1000 watts (power is voltage times current), so do not try it unless you have a resistor, a power supply, and a setup that can handle the power load!
When measuring the voltage across a resistor the reading is 0v what is the first step to locate the problem?
The resistor has gone to open ( or possibly short ) circuit. Remove ( if possible ) the resistor from the circuit and measure its stand alone resistance. If the resistor measures infinate then you need to replace it with whatever the circuit asks for. ie 10ohms, 15 ohms etc. Make sure you test the simple things first such as power supply and ensure that you are receiving power to at least one side of the resistor. If you are working on an electronic card then make sure you check your ' circuit paths ' you may have a burnt track. Test your continuity across your paths. Don't nescessarily concerntrate on the resistor itself it may not have power on it due to another component failure or circuit failure. Cheers.
Voltage drop of 15 Volts across 2.7 killo ohm resistor?
You just stated that the voltage across the resistor is 15 volts, so that's your answer ! If the resistor is connected to a 15-V battery or to the output of a 15-V power supply, then a meter across the resistor is also across the power supply, and reads 15 volts. The current through the resistor is (V/R) = (15/2700) = 5.56 mA. The power dissipated by the resistor (and delivered by the battery) is (V2/R) = (225/2700) = 0.083 watt.
How do you find the power of a power?
You can find its open circuit voltage very easily with a meter, but that doesn't signify its power. For that you need to connect a suitable load (resistor) and measure the current delivered. Then power = volts x amps.
Can a fixed resistor be used as a dimmer in a lighting circuit and if no what can be?
No. A fixed resistor cannot be used as a dimmer in a lighting circuit. Depending on the dimming setting, you would need to dissipate substantial power across the resistor. What you need instead is some kind of pulse width modulated device, such as an SCR or TRIAC, or switching power supply, that does not dissipate a lot of power when it is turned on, because it operates in saturated mode, but the average power delivered to the load is what you want it to be.
What is the function of a cement resistor?
A cement resistor is typically used as a power resistor (a resistor whose power rating is greater than 1 W).
How do you find power generated in a resistor?
The power generated in a resistor is converted into heat. and that can be power which is converted into heat is the product of the voltage across the resistor and, current passing through the resistor. or the product of square of the current and the resistance offered by the resistor.
What are the basics of how flashlights work?
You need a conductor, power source and a resistor. You need a conductor, power source and a resistor. You need a conductor, power source and a resistor.
What is the relation between the size of the resistor and its value?
There is no relation between the resistor's ohms value and its size. The power of the resistor can be seen by its size. If the power is too small, the resistor can be destroyed.
At what level will typical resistors burn out?
A typical resistor will burn out when it dissipates power in excess of double its power dissipation rating for an extended period of time. The power dissipated by a resistor is equal to I2R or E2/R, where E = the voltage across the resistor I = the current through the resistor R = the resistance of the resistor
2 resistors unequal value are in parallel. Would the power dissipated by the resistor with larger ohmic value be greater than the power dissipated by the resistor of lesser value?
No, because the power dissipated in a resistor is proportional to the square of the current through the resistor but only directly proportional to the resistance of the resistor (I^2 * R) and the current through the lower value resistor will be higher than the current through the higher value resistor, the lower value resistor will usually dissipate more power.
