The Keyless Lock Store™
Search By Manufacturer

 
Show Order - Your Shopping Cart
Info & FAQ & Store Policies (Please Read)
Privacy Policy
Search
Home > » Glossary - Resources - Diagrams > Power Demands For A System

Power Demands For A System


When installing any new fire, security, CCTV or access control system, one of the first and most important considerations is power demand. Knowing this allows efficient and cost-effective matching of power supply to the system requirements. The same is true when a new device is added to an existing system. Will the system's power supply be able to handle the additional power requirements? The following equation is a helpful tool to determine what the total power demand of a system will be:
Power (in Watts) = Current (in Amps) x Voltage (in Volts)


VA is power in watts described for AC systems. 100 VA equals 100 Watts.

To determine the power requirements for a system, add the total AMPs required by each device in the installation and multiply by the Voltage
EXAMPLES:
1. Given a relay coil with a resistance of 300 Ohms and an Activation Voltage of 12 Volts, how much current is needed? Divide 12 Volts by 300 Ohms. This equals .04 AMPs, or 40 milliamps. NOTE: 1000 milliamps equals 1 AMP.


2. Given a device that draws a 350 milliamp current at 12 volts, what is the power requirement of the system? Multiply .35 AMPs by 12 to get 4.2 Watts.


3. Given a 24 VDC system with 5 devices that draw 100 Milliamps each, and one device that draws 1 AMP, what is the total power demand of the system? In this case, five devices at .1 AMPs each (100 milliamps) plus one device at 1 AMP equals .1+.1+.1+.1+.1 + 1.0, which is equal to 1.5 AMPs. Multiplied by 24Volts, the total power demand of the system is 36VA, or 36 Watts.




AddThis Social Bookmark Button








We take these credit cards
We also accept Paypal for US orders and now also international orders through our International Checkout.

Our Privacy Policy | INTERNATIONAL ORDERING (NEW!) | To Translate Our Site To Other Languages | Store Policies | Help | Show Order
Why Shop At Yahoo Top Rated Stores? | What Our Customers Are Saying!



We are proud to be A top rated store!



Phone: 561 479-0498 or Fax: 561 488-7963

Have a question or comment? e-mail us! We look forward to hearing from you!
In This Business Since 1978



All rights reserved 1996-2018 The Keyless Lock Store™ and Nokey.com™





Customer Testimonials Taken Directly From Shopping
Knock lock  (Knocklock) - Knock To Unlock

Knock lock (Knocklock) - Knock To Unlock
$129.00
Aiphone Very  Easy To Install Intercom System

Aiphone Very Easy To Install Intercom System
$149.00
Amsec Electronic Pistol Safe

Amsec Electronic Pistol Safe
$169.00
Amsec Extra Large Fire Rated Electronic Wall Safe

Amsec Extra Large Fire Rated Electronic Wall Safe
$580.00
Supra Keyless Digital Key Cabinet

Supra Keyless Digital Key Cabinet
$109.00
Yale  (Assa-Abloy)  Assure  (Real Living) Electronic Deadbolt Lock

Yale (Assa-Abloy) Assure (Real Living) Electronic Deadbolt Lock
$269.00
Yale/Arrow NexTouchTouchscreen  Electronic Lock

Yale/Arrow NexTouchTouchscreen Electronic Lock
$479.00
The Lure Of The Lock Book

The Lure Of The Lock Book
$69.00