4 volts and how many amps? Watts = amps x volts. It depends on the amount of current (in Amps) flowing at 4 Volts...
See Ohms Law: Watts = Volts x Amps
If you have 2 Amps flowing at 4 Volts you are dissipating/consuming 8 Watts.
If you have 10 Amps flowing at 4 Volts you are dissipating/consuming 40 Watts.
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Watts is the product of amps x volts. To give an answer the amperage needs to be given.
Ohms does not equal watts. You need to know what voltage is across the resistor to determine how many watts it is drawing or how many watts the resistor should be rated for.Power is the voltage across the resistor SQUARED divided by the resistance. If this 4 ohm resistor has 12 volts across it then the watts power is (12 x 12) / 4 = 36 watts.1 Watt equals 1 Volt times 1 Amp.
That depends on circuit voltage. 1 watt is equal to 1 volt times 1 amp.
That gives you 18.5 amps.
Ohms can be found by using these formulas. Ohms = Volts/Amps, Ohms = (Volts (squared))/Watts, Ohms = Watts/(Amps (squared)).