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Summary: Watts out DC = 75% to 90% of AC Watts in, in most cases. See below: Energy is 'conserved" and energy = Watts x time. eg we often measure energy in Watt.seconds = Watts x seconds operated = Joules. The efficiency of conversion depends on the technology. Power level and voltage also give an effect.
Mainly used for powering lamps. Not solid core, 2*0.75mm² cable) laying around, that's rated for 1380 watts. Our wall sockets provide 230V at 50 hertz, so 1380 watts is 6 amps. I've got a 3d printer, on which I want to change the power supply. The current one is 21 amps at 12V DC, or 252 watts.
So 66~72 Watts. I expect that the power supply is rated to deliver up to 10 Amps at 12 volts = 120 Watts. If you only draw 5 amps, the supply is only delivering 60 Watts, and will only draw 60 watts, plus a little for inefficiency, maybe a total of 70 watts, from the AC power source. if you use a switching AC to DC converter with an efficiency ...
How to convert high voltage 500 volts DC at very low amps to lower voltage 12 volt DC or AC at high amps? Must I use an electrostatic motor or can I use an op amp? The reason I am posing this is a desire to send up a wire to convert atmospheric electricity to something I can use.
In most cases a -same size- DC fuse will work in an AC circuit. UNLESS it's on something with an electric motor circuit. Motors have a 'start' amp load and a 'run' amp load. A DC fuse is unforgiving of spikes and will quickly burn out when the motor starts -unless- it is rated at several times higher than the 'run' amps of the motor.
This means, for instance, that if the capacitor is charged to 20 volts, the output current must be greater than 14 volts for a 15 amp current. 4) Thermal considerations have not been addressed. If you look at the 2N3055 data sheet and the power derating curve, you'll see that 115 watts is allowed only for a case temperature of 25 degrees C or less.
AC or DC voltage: AC signals are easier to break, i.e. less contact pitting or arcing, since the potential difference falls to zero twice per cycle. Thus, when used for DC, I prefer to assume 10% of the highest rated AC voltage, while keeping the current rating the same as the lowest rated current for the AC specifications.
To provide that power at a lower voltage you increase the current (or vice versa). Power is voltage multiplied by current. 1000 Watts can be 250 volts RMS AC x 4 amps (i.e. 250 x 4 = 1000). 1000 Watts can be 12 volts DC x 83.3 amps (i.e. 12 * 83.3 = 1000). Share.
A simple procedure when calculating AC versus DC gain is to consider all the capacitors open for the DC case and shorts for the AC case. Then you can look more closely and see what resistance are accross or in series with the capacitors and use the formula: F = 1 / (2πRC) to see at what frequency the high pass or low pass rolloff is at.
(Note that \$1\text{ Watt} = 1\text{ Volt}\times 1\text{ Amp}\$) Second, the difference between AC and DC current: DC current is a steady flow, like a river. This is the type of current that batteries produce. AC current sloshes back and forth at a specific frequency, and for technical reasons is easier to convert to high voltage.