As an electrical engineering expert, I specialize in understanding and solving problems related to electrical power and its various parameters. One of the fundamental concepts in this field is the relationship between watts, amps, and volts, which is encapsulated in the formula: Power (W) = Voltage (V) × Current (A).

Now, to determine how many amps are in 900 watts, we must first know the voltage at which this power is being measured. If we are dealing with a common household voltage of 120 volts, we can rearrange the formula to solve for the current (amps) by dividing the power by the voltage:

\[ \text{Current (A)} = \frac{\text{Power (W)}}{\text{Voltage (V)}} \]

Plugging in the values for 900 watts at 120 volts, we get:

\[ \text{Current (A)} = \frac{900 \text{ W}}{120 \text{ V}} = 7.5 \text{ A} \]

This calculation tells us that for a 120-volt system, 900 watts of power would require a current of 7.5 amps.

However, if the power system is different, for example, a 240-volt service, the calculation would change. In a three-phase system, which is often used in industrial applications, the calculation would also differ. It's important to note that the three-phase system is designed for industrial use and involves a different configuration of power distribution.

In a three-phase system, the power calculation would typically involve the root of three (√3) factor, due to the phase difference between the lines. But for the sake of simplicity and given the information provided, we will stick to the single-phase calculation.

It's also worth mentioning that the example provided, where 1000 watts at 120 volts equates to 8.33 amps, is correct and follows the same principle of power calculation. This further reinforces the understanding that the current required is directly proportional to the power consumed, given a constant voltage.

In summary, understanding the relationship between watts, amps, and volts is crucial in electrical engineering. The calculation provided is a straightforward application of this relationship, and it's essential to know the voltage at which the power is being measured to accurately determine the current in amps.

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3 phase is for industrial use only. Amps times volts gives watts for 120 or 240 volt service. 900 watts at 120 volts is 7.5 amps. 1000 watts at 120 volts is 8.33 amps.read more >>