How many watts is one degree of electricity?

How many watts is one degree of electricity?

1000 watts in an hour
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How many milliamps is a watt of electricity
One degree of electricity is also known as one thousand watt hours, which means voltage (V) * current (a) * hours,
One watt is the power and milliampere is the unit of current
Power = voltage * current
When the voltage is determined, the current can be calculated
One watt equals 1000 Ma
Who can give a brief introduction to Einstein, Galileo and Newton
In 1643, Sir Isaac, a member of the British Society of natural philosophy, published his paper on the principles of nature
How to calculate the wire diameter when the motor power and current are known
Formula: line diameter x flow coefficient = current carrying capacity
1.5 X 8
（2.5、4、6）X7
（10、16、25）X6
（35、50）X5
（50、70、95）X4
（120、150、185）X3
240 and above less than 3
In switching power supply, what is the function of a 1m ohm resistor between the AC 220 V live line and the zero line
Want to do a 220 V AC power indicator, plan to use a LED plus a buck resistor production, please use
The peak voltage of 220 V AC is about 310 v. the general working current of LED is 10 ~ 20 mA, and the middle value is 15 mA
According to the calculation, 310 (V) △ 0.015 (a) = 20666.7 (Ω)
That is, 20K ~ 21k resistor in series
In addition, since the LED is single ended, it is recommended to use the rectifier circuit (the filter can not be used)
Copernicus, Edison, Einstein, Newton, Archimedes and others, who has the highest achievement
Such as the title
It should be Newton
Among the world's great men ranked by the most authoritative western scholars,
The top of these people is Newton, the second and the first is Muhammad
Einstein is tenth. You can go and see for yourself
Power 100kW, 380V voltage, how much a current
196A.
I chose a metal film resistor of 1m ohm / 2W and a metal film resistor of 250 ohm / 0.25W, with an accuracy of 1% and 50ppm. Apart from the withstand voltage and power, there are others
In addition to withstand voltage and accuracy, for DC measurement, no problem
However, if measured for a long time, the actual power consumption of 2W resistor reaches 1W under 1000V voltage. If there is no good ventilation fan heat, the temperature rise of the resistor may be higher. It is suggested to increase the resistance value or power or use two resistors in series
The accuracy of the resistance is not very important, and can be corrected again. The temperature coefficient of 50ppm is good for this kind of resistance
LED as indicator light, how much resistance should AC 220 V and DC 12 V power supply be connected in series?
The key depends on the current rating of your led?
If it is 10 Ma, AC 220 V, it is better to adopt full bridge rectification and capacitor step-down mode; if it is used resistance step-down, r = 220 V / 10 Ma = 22 K, select 22 K resistance. The power of resistance should be at least 3 W, preferably 5 W
12V power: (12-2) V / 10mA = 1K, 1K resistor. 0.25W