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Simple is just to know two formulas

Ohm's Law

V = IR

Power

P = IV

From those you can calculate voltage, amps, watts, ohms

V = Voltage (volts)

I = Current (amps or amperes)

R = Resistance (ohm's)

P = Power (watts)

Just solve for what you are missing.

Voltage times amps being drawn shows watts produced.

Watts divided by voltage shows amps being drawn or watts

divided by amperage shows voltage applied.

= = = = = = = = = = = = = = = = =

Power in watts (P) is voltage in volts (E) times current in amps(I).

P = E*I, E=P / I, I = P / E.

In a.c. that is peak to peak. To derive actual R.M.S. wattage (The true ability to do work)

you multiply peak to peak by 0.3535.

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โˆ™ 2015-07-15 21:46:25
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Q: How do you figure how many watts amps or volts?
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How many amps does a 1000 watt metal halide bulb draw?

Watts is the figure used to show how much power a device consumes. Watts = volts * amps OR watts / volts = amps, so: At 120 volts, 1000 watts / 120 volts = 8.33 amps, or: At 220 volts, 1000 watts / 220 volts = 4.55 amps


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