Efficiency of any electrical machine is maximum when the load on that machine is such that the variable loss ( copper loss) is equal to constant loss (eddy current loss, hysteresis etc).the same applies to dc machines too.
It can be done with 90% efficiency.
No. You need 12 volt AC to run a 12 volt AC motor, not 12 volt DC.
Motor: 12v AMP usage: 1.2amp Watt: 12x1.2=14.4W
A variable power supply has a control to adjust the DC output voltage from 0 to 12 volts. It is used for testing electric project's such as amplifiers and other electric devices. It can be used to replace other fixed voltages power supplies such as the srandard 3 volt, 5 volt, 9 volt and 12 volt units.
This might be a homework question, in which case you find the power, which is 3 x 746 watts, and divide by the voltage to find the current taken if the efficiency is 100%, and that is 9.325 amps. So the efficiency is 9.325/12 or 77.7%. In practice the question is complicated by the power factor of the motor, which means that the watts taken are less than the volts times amps. The power factor could well be 0.777, in which case the efficiency would be 100%.
....on an automobile it is a 12 volt DC motor. the electric cooling fan is driven from this type motor.....
It can be done with 90% efficiency.
It depends on the current rating of the armature winding, which will determine its input power. It's output power then depends on the motor's efficiency.
12 Volts DC
No. You need 12 volt AC to run a 12 volt AC motor, not 12 volt DC.
If a single 12 volt source as in 2,6 volt batteries wired in sequence or one 12 volt battery can be isolated from the system it is possible.
no
The voltage of 120 volts is more common that the lower voltage of 12 volts.
The Thunderbolt ignition is a 12 volt system.
For a 20 amp 220 volt electric motor, you would typically want to use a wire that is rated for at least 12 AWG (American Wire Gauge) to ensure proper power transmission and safety. It's always best to consult local electrical codes or a certified electrician to ensure compliance and safety.
Probably about 180 watts, assuming 90% efficiency.
expecto patronum! ~:)