20 amp equals how many watts?
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Volts = Watts / Amps 2400 Watts / 20 Amps = 120 Volts. 2400 Watts / 10 Amps = 240 Volts.
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Assuming a 120VAC fixed-voltage source, 120 Watts corresponds to one Ampere, because the definition of electrical power is that one Watt equals one Volt times one Ampere.
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The equation is W = AV(sqrt 3) where A is amperes, V is volts, and sqrt 3 is the square root of 33 (about 1.73). W is the power consumption in watts. For example, if the electric motor uses 50 amps at 240 volts, the wattage is 50 x 240 x 1.73, or 20,760 watts.
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A 3Kw inverter may typically draw around 20 watts from your batteries when no AC current is being used. It would then follow that if you are using 20 watts of AC power, the inverter will be drawing 40 watts from the batteries and the efficiency will only be 50%.
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Watts are a unit of power and power equals voltage multiplied by the current. So 1 kva equals 1000 volt amps, meaning volts multiplied by amps, therefore equals 1000 watts.
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Examples: 2400 Watts / 20 Amps = 120 Volts. 2400 Watts / 10 Amps = 240 Volts.
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To obtain Watts you need both Amps and Volts: The formula is (A)*(V) = (W). For example, if you have a current of 2 A and a voltage of 5 V, the power is 2A * 5V = 10W. This comes from the equation P = I * V. Where P is the power in Watts, I is the current in Amps and V is the voltage in Volts.
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Amp-Hours and Watts Defined So, if a battery provides 10 amps of current for 10 hours, it is a 10 amps × 10 hours = 100 Ah battery. A watt (W) is a measure of power, with 1 watt representing one joule (a unit of energy) per second. So, if a light bulb uses 60 watts, it requires 60 joules of energy per second.
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Calculate the current in amps by dividing power in watts by the voltage in volts. For example, if the solar panel is rated at 175 watts and the maximum power voltage, Vmp, is given as 23.6 volts, then calculate the current as 175 watts divided by 23.6 volts, which is equal to 7.42 amps.
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Locate the circuit for which you want to calculate the circuit load. Take the breaker size and multiply it by the rated voltage. For example, a 20 amp breaker that operates at 120 volts has a maximum load of 2400 watts.
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In a resistive load you simply multiply the voltage times the current. So 13 amps times 220 volts gives 2,860 watts.
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Using Ohms law, you would multiply amperage times volts to get watts. For instance a 12 volt circuit drawing 2 amps would consume 24 watts of power (12*2=24). A 60 watt light bulb powered by 120 volts in a house would draw . 5 amp of current (60/120= .
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Thus - 1 (Amp) x 1 (Volt) = 1 Watt. say any Electric Appliance (May be an Electric Heater) having power of 1 Kilo Watt (i.e. 1000 watt), at Supply Voltage of 230 Volts, will draw a current = 1000(Watt)/ 230(Volts) = 4.3 Amps (aprox.) 60 Hertz in 1 Watt!
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The number of watts is equal to amps multiplied by volts. That's it! In other words, watt=amp X volt. Sometimes you will see this formula written as W=A X V.
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In the United States, most household appliances work at 110 Volts. So the calculation is divide the Wattage by 110. For example: A 40 Watts bulb draws 0.36 Amps to operate. A 60 Watts bulb draws 0.54 Amps to operate.
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As others have already answer to this question, power is the product of voltage and current. =I (sq) r. So There will be 250 watts in 250 volt if current drawn by your bulb is, say 1 Amp. 250 v x 1 amp = 250 watt.
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The 20-watt amp is double the power of the 10-watt amp, but doubling the power only translates to an increase of 3 dB SPL. Remember, in order to sound "twice as loud," you need an increase of 10dB, so while a 20W amplifier will sound noticeably louder than a 10W amp, it will not sound twice as loud.