# Electricity FAQs

• Q. What is power?
• Power is the product of Voltage (V) and Current (A).
Power = Voltage x Current
• Q. What is VA, Watt and Power Factor?
• The unit of measuring A.C. power is VA and the unit of measuring D.C. power is Watts. The relation between Watt and VA is;
Watts = VA x Power Factor
Power Factor, basically Power Factor decides how much real power is consumed (watts) from the total applied power (VA). In our products, the term VA is used to define the capacity of the system, i.e. how much load it can handle.
• Q. What does the VA and V means on the system?
• The VA (Volt-Ampere) on the system means the system’s load handling capacity. If a system has 600 VA/12V mentioned on it, then it can handle 420 Watts. A low capacity system has a power factor of 0.7/0.8, thus the load that can be applied on 600 VA is as follows
420 Watts = 600 (VA) x 0.7 (Power Factor)
In 600VA/12V, 12V means, how many volts battery supply should be given.
If it is 12V, then one battery is connected as one battery is of 12V.
Similarly, if it is mentioned as 1000VA/24V, then two batteries are connected. By combining two batteries 24V is been generated.
• Q. What is Voltage and Current?
• Current acts just like a fuel needed for the equipments to run.
As petrol is a fuel for engines, similarly current is a fuel for the electrical equipments. Technically current is the no. of electrons flowing from one point to other point.
It is measured in Amperes (A)
Voltage is like the pressure being applied at what rate the current will flow. It is measured in Volts (V).
• Q. What is AC (Alternating current)
• Alternating currents — The term alternating current refers to a current that reverses at regular recurring intervals of time and that has alternately positive and negative values.

Alternating current (advantages) — As compared with DC, the advantage of AC is the reduced cost of transmission by use of high voltage transformers
• Q. What is KILO (VOLT & WATTS)
• Kilovolt (kv) — A unit of pressure equal to one thousands volts.
Kilowatt — A unit of electrical power, equal to one thousands watts.
Electric power is usually expressed in kilowatts.
The 1kilowatt or 1,000 watts = 1.34 hp.
1Horsepower = 746 WATTS.
• Q. What is HORSE POWER
• A measurement of mechanical power that a motor produces.
In electrical terms, one horse power equals 746 watts.
In mechanical terms, one horse power is produced when 33,000 pounds are lifted one foot in one minute.
• Q. What is Hz (Hertz)?
• The no. of waves (cycles) in one second is known as Hertz.
The supply available in India has the frequency of 50 Hz, thus this waves occurs 50 times in one second.
• Q. What is “mains”?
• The supply being received at our home/office through the Energy meter is mentioned as mains supply. The rating of mains supply is 230V/50Hz.
• Q. What is phase and neutral?
• Phase is the wire from where the current (power) is being supplied. It can be checked by touching tester and the light glows. Generally ‘red’ wire is used for this connection.
Neutral is the next wire paired with the phase. It is used to send back the current coming from phase through the device used. Black wire is used for this connection.
• Q. What is 3-phase system?
• When 3 no. of phase wires are used together on the single device paired with one neutral wire, then it is named as 3-phase system. The three phases when used together, then they all has different colors, they are: - Red, Yellow Blue. Thus the name RYB is used to indicate the 3-phase system.
• Q. What is surge current?
• There are many loads having compressive/inductive nature. These types of loads consumes 3 – 5 times of its normal current during starting time for a fraction of second to multiple seconds.
Example of these types of loads are;
A.C.>
Motor
Lifts
Refrigerator
• Q. What is Pure Sine wave and Quasi Sine wave?
• The A.C. power available at our home is in Pure Sine wave. All our equipments are equipped for sine wave. Inverter should also produce sine wave. Producing sine wave through inverter is costly and thus few systems produce quasi sine wave. Quasi sine wave is a deteriorated form of pure sine wave. Quasi sine wave inverters are made, so it can be cost effective.
• Q. What is quasi sine wave?
• Producing sine wave through inverter is costly and thus few systems produce quasi sine wave. Quasi sine wave is a deteriorated form of pure sine wave. Quasi sine wave inverters are made, so it can be cost effective.

Quasi means ‘close to’. It is not pure sine wave but has a similar nature like sine wave. It is also known as modified square wave. Using quasi sine wave is hazardous for the equipment and produces humming sound. • Q. Why D.C. power is needed when all equipments run on A.C. power?
• Due to the nature of A.C. power it cannot be stored, thus it is converted into D.C. power. Then further we can convert Dc to AC.