0. It is a non-powered sub unit.
The rca connector is the driver & the other plug is the switch.
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Typically, a ss-wg450 subwoofer requires an external amplifier to provide power for operation. The voltage required would depend on the specifications of the amplifier being used, which might be in the range of 12-24 volts for car audio systems or 120 volts for home audio setups. It's important to refer to the subwoofer's manual or contact the manufacturer for the specific voltage requirements.
The equation that you are looking for is I = W/E. Amps = Watts / Volts.
9000 BTU/hour is equivalent to 2300 watts so the heater will draw 10 amps on 230 volts.
45 volts
To calculate the amperage, use the formula: Amps = Watts / Volts. Assuming a typical voltage of 120 volts for a pool light, the calculation would be 500 watts / 120 volts = 4.17 amps.
You generally need the same number of volts for a given amount of light (lumens), regardless of how many hours you use it. They typically measure the amount of energy used by a bulb in "watts", not volts, and you can find a wide range of wattage ratings from milliwatt LEDs to 1000-watt floodlights and on up.