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1. When do you use a VFD motor?
2. If the ceiling fan is on slow speed, does it consume less
electricity?
3. If we want the fan to consume less electricity at low
speed, what do we have to do?
4. What does “battery of 180 AMP HOUR” mean to you?
5. What does “battery of 180 AMP HOUR” mean to you?
6. If you don’t have coal, salt and copper, then how would
you earth your connection temporarily at a camp site.?
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Answer Posted / b.veeranna
1.Variable Frequency Drive (VFD) to operate the fan at variable speed. Since you can operate the fan at any speed below its maximum, you can vary airflow by controlling the motor speed instead of the air outlet damper.You can divide the world of electronic motor drives into two categories: AC and DC. A motor drive controls the speed, torque, direction and resulting horsepower of a motor. A DC drive typically controls a shunt wound DC motor, which has separate armature and field circuits. AC drives control AC induction motors, and-like their DC counterparts-control speed, torque, and horsepower.
2.if regulator is electronic then it save electricity but if
regulator is resistance base then it doesn't save.If regulator is electronics
4.Battery rating (capacity) =180 AH
Battery capacity in ampere hour.
in normal condition ,dc current of 180 ampere for one hour.
it is product of load current x time (for which it can supply)
4.Small refrigerators range in size from around 1/2 ft^3 to several ft^3, so it's hard to say, but it won't be anywhere near the power consumed by a full-sized refrigerator/freezer. Maybe about 25% of the power or less as a rough guess.
The amount of power is published by the manufacturer in the product literature, and is also printed on the unit.
5.The rate at which the batter is discharged directly affects its capacity. If a battery is dischareged quickly less capacity is available. Conversely, a battery that is dischraged slowly will have a greater capacity. For example , a six volt battery may have a 180 AH capacity if discharged over 24 hrs. However if the same battery is discharged over 72 hrs it will have a 192 AH capacity.
6.Salt and coal are require to reduce the earth resistance
hence it may or may not required for all soil.
The copper is a one of the conductor ..If the copper is not
there we can use other alternative conductor such as steel
or aluminium
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