Without specific information I cannot answer your question, however you can work it out.
For a dc or single phase system you need to know 2 simple laws. P=V x I & V=I x R
where:
P = power in watts
V = Voltage in Volts
I = Current in Amps
R=Resistance in Ohms
we can therefore derive that since I=V/R and P=V x I then P=V x V/R or vsquared over R
or in your case R = V(squared) / P = 12 x 12 / 30 = 144/30 = 4.8 ohms
Now use the formula supplied with your voltage value, and you will know what the resistance is .
See isn't math fun.
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To find the power in watts for a 30-ohm resistor, you need to know the voltage or current flowing through it. You can use Ohm's Law (P = V^2 / R or P = I^2 * R) to calculate the power. Without voltage or current information, it's not possible to determine the power in watts for a 30-ohm resistor.
Watts is a measure of power and Ohms is a measure of resistance. A resistor has a maximum rating in watts, but you need to know either the voltage across the resistor or the current through the resistor to compute wattage.
Watts = Volts x Amps
Volts = Amps x Ohms
There is no way to tell, you don't have enough information.
Watts are what you get by multiplying the amps x the voltage. Simply put, Volts X Amps = Watts.
To calculate the resistance in ohms, you also need to know the voltage. The formula to find the resistance in ohms is R = V^2 / P, where R is the resistance in ohms, V is the voltage, and P is the power in watts.
The Kicker Impulse 352xi amp has a maximum power output of 35 watts per channel x 2 channels at 4 ohms or 35 watts x 2 channels at 2 ohms.
The Urei 6250 power amplifier has a power output of 250 watts per channel into 8 ohms.
The Sony XM752X amplifier can output up to 280 watts RMS per channel at 4 ohms, or 380 watts RMS per channel at 2 ohms, when both channels are driven with a 20Hz - 20kHz signal.
The power in watts is equal to the volts times the amps so that is 120 x 7.5.